edgefirst_image/

lib.rs

// SPDX-FileCopyrightText: Copyright 2025 Au-Zone Technologies
// SPDX-License-Identifier: Apache-2.0

/*!

## EdgeFirst HAL - Image Converter

The `edgefirst_image` crate is part of the EdgeFirst Hardware Abstraction
Layer (HAL) and provides functionality for converting images between
different formats and sizes.  The crate is designed to work with hardware
acceleration when available, but also provides a CPU-based fallback for
environments where hardware acceleration is not present or not suitable.

The main features of the `edgefirst_image` crate include:
- Support for various image formats, including YUYV, RGB, RGBA, and GREY.
- Support for source crop, destination crop, rotation, and flipping.
- Image conversion using hardware acceleration (G2D, OpenGL) when available.
- CPU-based image conversion as a fallback option.

The crate uses [`TensorDyn`] from `edgefirst_tensor` to represent images,
with [`PixelFormat`] metadata describing the pixel layout. The
[`ImageProcessor`] struct manages the conversion process, selecting
the appropriate conversion method based on the available hardware.

## Examples

```rust
# use edgefirst_image::{ImageProcessor, Rotation, Flip, Crop, ImageProcessorTrait, load_image};
# use edgefirst_tensor::{PixelFormat, DType, TensorDyn};
# fn main() -> Result<(), edgefirst_image::Error> {
let image = include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/../../testdata/zidane.jpg"));
let src = load_image(image, Some(PixelFormat::Rgba), None)?;
let mut converter = ImageProcessor::new()?;
let mut dst = converter.create_image(640, 480, PixelFormat::Rgb, DType::U8, None)?;
converter.convert(&src, &mut dst, Rotation::None, Flip::None, Crop::default())?;
# Ok(())
# }
```

## Environment Variables
The behavior of the `edgefirst_image::ImageProcessor` struct can be influenced by the
following environment variables:
- `EDGEFIRST_FORCE_BACKEND`: When set to `cpu`, `g2d`, or `opengl` (case-insensitive),
  only that single backend is initialized and no fallback chain is used. If the
  forced backend fails to initialize, an error is returned immediately. This is
  useful for benchmarking individual backends in isolation. When this variable is
  set, the `EDGEFIRST_DISABLE_*` variables are ignored.
- `EDGEFIRST_DISABLE_GL`: If set to `1`, disables the use of OpenGL for image
  conversion, forcing the use of CPU or other available hardware methods.
- `EDGEFIRST_DISABLE_G2D`: If set to `1`, disables the use of G2D for image
  conversion, forcing the use of CPU or other available hardware methods.
- `EDGEFIRST_DISABLE_CPU`: If set to `1`, disables the use of CPU for image
  conversion, forcing the use of hardware acceleration methods. If no hardware
  acceleration methods are available, an error will be returned when attempting
  to create an `ImageProcessor`.

Additionally the TensorMemory used by default allocations can be controlled using the
`EDGEFIRST_TENSOR_FORCE_MEM` environment variable. If set to `1`, default tensor memory
uses system memory. This will disable the use of specialized memory regions for tensors
and hardware acceleration. However, this will increase the performance of the CPU converter.
*/
#![cfg_attr(coverage_nightly, feature(coverage_attribute))]

use edgefirst_decoder::{DetectBox, ProtoData, Segmentation};
use edgefirst_tensor::{
    DType, PixelFormat, PixelLayout, Tensor, TensorDyn, TensorMemory, TensorTrait as _,
};
use enum_dispatch::enum_dispatch;
use std::{fmt::Display, time::Instant};
use zune_jpeg::{
    zune_core::{colorspace::ColorSpace, options::DecoderOptions},
    JpegDecoder,
};
use zune_png::PngDecoder;

pub use cpu::CPUProcessor;
pub use error::{Error, Result};
#[cfg(target_os = "linux")]
pub use g2d::G2DProcessor;
#[cfg(target_os = "linux")]
#[cfg(feature = "opengl")]
pub use opengl_headless::GLProcessorThreaded;
#[cfg(target_os = "linux")]
#[cfg(feature = "opengl")]
pub use opengl_headless::Int8InterpolationMode;
#[cfg(target_os = "linux")]
#[cfg(feature = "opengl")]
pub use opengl_headless::{probe_egl_displays, EglDisplayInfo, EglDisplayKind};

/// Result of rendering a single per-instance grayscale mask.
///
/// Contains the bounding-box region in output image coordinates and the
/// raw uint8 pixel data (RED channel only, 0–255 representing sigmoid output).
#[derive(Debug, Clone)]
pub(crate) struct MaskResult {
    /// X offset of the bbox region in the output image.
    pub(crate) x: usize,
    /// Y offset of the bbox region in the output image.
    pub(crate) y: usize,
    /// Width of the bbox region.
    pub(crate) w: usize,
    /// Height of the bbox region.
    pub(crate) h: usize,
    /// Grayscale pixel data (w * h bytes, row-major).
    pub(crate) pixels: Vec<u8>,
}

/// Region metadata for a single detection within a compact mask atlas.
///
/// The atlas packs padded bounding-box strips vertically.  This struct
/// records where each detection's strip lives in the atlas and how it
/// maps back to the original output coordinate space.
#[must_use]
#[derive(Debug, Clone, Copy)]
pub struct MaskRegion {
    /// Row offset of this detection's strip in the atlas.
    pub atlas_y_offset: usize,
    /// Left edge of the padded bbox in output image coordinates.
    pub padded_x: usize,
    /// Top edge of the padded bbox in output image coordinates.
    pub padded_y: usize,
    /// Width of the padded bbox.
    pub padded_w: usize,
    /// Height of the padded bbox (= number of atlas rows for this strip).
    pub padded_h: usize,
    /// Original (unpadded) bbox left edge in output image coordinates.
    pub bbox_x: usize,
    /// Original (unpadded) bbox top edge in output image coordinates.
    pub bbox_y: usize,
    /// Original (unpadded) bbox width.
    pub bbox_w: usize,
    /// Original (unpadded) bbox height.
    pub bbox_h: usize,
}

mod cpu;
mod error;
mod g2d;
#[path = "gl/mod.rs"]
mod opengl_headless;

// Use `edgefirst_tensor::PixelFormat` variants (Rgb, Rgba, Grey, etc.) and
// `TensorDyn` / `Tensor<u8>` with `.format()` metadata instead.

/// Flips the image data, then rotates it. Returns a new `TensorDyn`.
fn rotate_flip_to_dyn(
    src: &Tensor<u8>,
    src_fmt: PixelFormat,
    rotation: Rotation,
    flip: Flip,
    memory: Option<TensorMemory>,
) -> Result<TensorDyn, Error> {
    let src_w = src.width().unwrap();
    let src_h = src.height().unwrap();
    let channels = src_fmt.channels();

    let (dst_w, dst_h) = match rotation {
        Rotation::None | Rotation::Rotate180 => (src_w, src_h),
        Rotation::Clockwise90 | Rotation::CounterClockwise90 => (src_h, src_w),
    };

    let dst = Tensor::<u8>::image(dst_w, dst_h, src_fmt, memory)?;
    let src_map = src.map()?;
    let mut dst_map = dst.map()?;

    CPUProcessor::flip_rotate_ndarray_pf(
        &src_map,
        &mut dst_map,
        dst_w,
        dst_h,
        channels,
        rotation,
        flip,
    )?;
    drop(dst_map);
    drop(src_map);

    Ok(TensorDyn::from(dst))
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Rotation {
    None = 0,
    Clockwise90 = 1,
    Rotate180 = 2,
    CounterClockwise90 = 3,
}
impl Rotation {
    /// Creates a Rotation enum from an angle in degrees. The angle must be a
    /// multiple of 90.
    ///
    /// # Panics
    /// Panics if the angle is not a multiple of 90.
    ///
    /// # Examples
    /// ```rust
    /// # use edgefirst_image::Rotation;
    /// let rotation = Rotation::from_degrees_clockwise(270);
    /// assert_eq!(rotation, Rotation::CounterClockwise90);
    /// ```
    pub fn from_degrees_clockwise(angle: usize) -> Rotation {
        match angle.rem_euclid(360) {
            0 => Rotation::None,
            90 => Rotation::Clockwise90,
            180 => Rotation::Rotate180,
            270 => Rotation::CounterClockwise90,
            _ => panic!("rotation angle is not a multiple of 90"),
        }
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum Flip {
    None = 0,
    Vertical = 1,
    Horizontal = 2,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Crop {
    pub src_rect: Option<Rect>,
    pub dst_rect: Option<Rect>,
    pub dst_color: Option<[u8; 4]>,
}

impl Default for Crop {
    fn default() -> Self {
        Crop::new()
    }
}
impl Crop {
    // Creates a new Crop with default values (no cropping).
    pub fn new() -> Self {
        Crop {
            src_rect: None,
            dst_rect: None,
            dst_color: None,
        }
    }

    // Sets the source rectangle for cropping.
    pub fn with_src_rect(mut self, src_rect: Option<Rect>) -> Self {
        self.src_rect = src_rect;
        self
    }

    // Sets the destination rectangle for cropping.
    pub fn with_dst_rect(mut self, dst_rect: Option<Rect>) -> Self {
        self.dst_rect = dst_rect;
        self
    }

    // Sets the destination color for areas outside the cropped region.
    pub fn with_dst_color(mut self, dst_color: Option<[u8; 4]>) -> Self {
        self.dst_color = dst_color;
        self
    }

    // Creates a new Crop with no cropping.
    pub fn no_crop() -> Self {
        Crop::new()
    }

    /// Validate crop rectangles against explicit dimensions.
    pub(crate) fn check_crop_dims(
        &self,
        src_w: usize,
        src_h: usize,
        dst_w: usize,
        dst_h: usize,
    ) -> Result<(), Error> {
        let src_ok = self
            .src_rect
            .is_none_or(|r| r.left + r.width <= src_w && r.top + r.height <= src_h);
        let dst_ok = self
            .dst_rect
            .is_none_or(|r| r.left + r.width <= dst_w && r.top + r.height <= dst_h);
        match (src_ok, dst_ok) {
            (true, true) => Ok(()),
            (true, false) => Err(Error::CropInvalid(format!(
                "Dest crop invalid: {:?}",
                self.dst_rect
            ))),
            (false, true) => Err(Error::CropInvalid(format!(
                "Src crop invalid: {:?}",
                self.src_rect
            ))),
            (false, false) => Err(Error::CropInvalid(format!(
                "Dest and Src crop invalid: {:?} {:?}",
                self.dst_rect, self.src_rect
            ))),
        }
    }

    /// Validate crop rectangles against TensorDyn source and destination.
    pub fn check_crop_dyn(
        &self,
        src: &edgefirst_tensor::TensorDyn,
        dst: &edgefirst_tensor::TensorDyn,
    ) -> Result<(), Error> {
        self.check_crop_dims(
            src.width().unwrap_or(0),
            src.height().unwrap_or(0),
            dst.width().unwrap_or(0),
            dst.height().unwrap_or(0),
        )
    }
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub struct Rect {
    pub left: usize,
    pub top: usize,
    pub width: usize,
    pub height: usize,
}

impl Rect {
    // Creates a new Rect with the specified left, top, width, and height.
    pub fn new(left: usize, top: usize, width: usize, height: usize) -> Self {
        Self {
            left,
            top,
            width,
            height,
        }
    }

    // Checks if the rectangle is valid for the given TensorDyn image.
    pub fn check_rect_dyn(&self, image: &TensorDyn) -> bool {
        let w = image.width().unwrap_or(0);
        let h = image.height().unwrap_or(0);
        self.left + self.width <= w && self.top + self.height <= h
    }
}

#[enum_dispatch(ImageProcessor)]
pub trait ImageProcessorTrait {
    /// Converts the source image to the destination image format and size. The
    /// image is cropped first, then flipped, then rotated
    ///
    /// # Arguments
    ///
    /// * `dst` - The destination image to be converted to.
    /// * `src` - The source image to convert from.
    /// * `rotation` - The rotation to apply to the destination image.
    /// * `flip` - Flips the image
    /// * `crop` - An optional rectangle specifying the area to crop from the
    ///   source image
    ///
    /// # Returns
    ///
    /// A `Result` indicating success or failure of the conversion.
    fn convert(
        &mut self,
        src: &TensorDyn,
        dst: &mut TensorDyn,
        rotation: Rotation,
        flip: Flip,
        crop: Crop,
    ) -> Result<()>;

    /// Draw pre-decoded detection boxes and segmentation masks onto `dst`.
    ///
    /// Supports two segmentation modes based on the mask channel count:
    /// - **Instance segmentation** (`C=1`): one `Segmentation` per detection,
    ///   `segmentation` and `detect` are zipped.
    /// - **Semantic segmentation** (`C>1`): a single `Segmentation` covering
    ///   all classes; only the first element is used.
    ///
    /// # Format requirements
    ///
    /// - CPU backend: `dst` must be `RGBA` or `RGB`.
    /// - OpenGL backend: `dst` must be `RGBA`, `BGRA`, or `RGB`.
    /// - G2D backend: not implemented (returns `NotImplemented`).
    ///
    /// An empty `segmentation` slice is valid — only bounding boxes are drawn.
    fn draw_masks(
        &mut self,
        dst: &mut TensorDyn,
        detect: &[DetectBox],
        segmentation: &[Segmentation],
    ) -> Result<()>;

    /// Draw masks from proto data onto image (fused decode+draw).
    ///
    /// For YOLO segmentation models, this avoids materializing intermediate
    /// `Array3<u8>` masks. The `ProtoData` contains mask coefficients and the
    /// prototype tensor; the renderer computes `mask_coeff @ protos` directly
    /// at the output resolution using bilinear sampling.
    ///
    /// `detect` and `proto_data.mask_coefficients` must have the same length
    /// (enforced by zip — excess entries are silently ignored). An empty
    /// `detect` slice is valid and returns immediately after drawing nothing.
    ///
    /// # Format requirements
    ///
    /// Same as [`draw_masks`](Self::draw_masks). G2D returns `NotImplemented`.
    fn draw_masks_proto(
        &mut self,
        dst: &mut TensorDyn,
        detect: &[DetectBox],
        proto_data: &ProtoData,
    ) -> Result<()>;

    /// Decode masks into a compact atlas buffer.
    ///
    /// Used internally by the Python/C `decode_masks` APIs. The atlas is a
    /// compact vertical strip where each detection occupies a strip sized to
    /// its padded bounding box (not the full output resolution).
    ///
    /// `output_width` and `output_height` define the coordinate space for
    /// interpreting bounding boxes — individual mask regions are bbox-sized.
    /// Mask pixels are binary: `255` = presence, `0` = background.
    ///
    /// Returns `(atlas_pixels, regions)` where `regions` describes each
    /// detection's location and bbox within the atlas.
    ///
    /// G2D backend returns `NotImplemented`.
    fn decode_masks_atlas(
        &mut self,
        detect: &[DetectBox],
        proto_data: ProtoData,
        output_width: usize,
        output_height: usize,
    ) -> Result<(Vec<u8>, Vec<MaskRegion>)>;

    /// Sets the colors used for rendering segmentation masks. Up to 20 colors
    /// can be set.
    fn set_class_colors(&mut self, colors: &[[u8; 4]]) -> Result<()>;
}

/// Configuration for [`ImageProcessor`] construction.
///
/// Use with [`ImageProcessor::with_config`] to override the default EGL
/// display auto-detection and backend selection. The default configuration
/// preserves the existing auto-detection behaviour.
#[derive(Debug, Clone, Default)]
pub struct ImageProcessorConfig {
    /// Force OpenGL to use this EGL display type instead of auto-detecting.
    ///
    /// When `None`, the processor probes displays in priority order: GBM,
    /// PlatformDevice, Default. Use [`probe_egl_displays`] to discover
    /// which displays are available on the current system.
    ///
    /// Ignored when `EDGEFIRST_DISABLE_GL=1` is set.
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    pub egl_display: Option<EglDisplayKind>,

    /// Preferred compute backend.
    ///
    /// When set to a specific backend (not [`ComputeBackend::Auto`]), the
    /// processor initializes that backend with no fallback — returns an error if the conversion is not supported.
    /// This takes precedence over `EDGEFIRST_FORCE_BACKEND` and the
    /// `EDGEFIRST_DISABLE_*` environment variables.
    ///
    /// - [`ComputeBackend::OpenGl`]: init OpenGL + CPU, skip G2D
    /// - [`ComputeBackend::G2d`]: init G2D + CPU, skip OpenGL
    /// - [`ComputeBackend::Cpu`]: init CPU only
    /// - [`ComputeBackend::Auto`]: existing env-var-driven selection
    pub backend: ComputeBackend,
}

/// Compute backend selection for [`ImageProcessor`].
///
/// Use with [`ImageProcessorConfig::backend`] to select which backend the
/// processor should prefer. When a specific backend is selected, the
/// processor initializes that backend plus CPU as a fallback. When `Auto`
/// is used, the existing environment-variable-driven selection applies.
#[derive(Debug, Clone, Copy, Default, PartialEq, Eq)]
pub enum ComputeBackend {
    /// Auto-detect based on available hardware and environment variables.
    #[default]
    Auto,
    /// CPU-only processing (no hardware acceleration).
    Cpu,
    /// Prefer G2D hardware blitter (+ CPU fallback).
    G2d,
    /// Prefer OpenGL ES (+ CPU fallback).
    OpenGl,
}

/// Backend forced via the `EDGEFIRST_FORCE_BACKEND` environment variable
/// or [`ImageProcessorConfig::backend`].
///
/// When set, the [`ImageProcessor`] only initializes and dispatches to the
/// selected backend — no fallback chain is used.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub(crate) enum ForcedBackend {
    Cpu,
    G2d,
    OpenGl,
}

/// Image converter that uses available hardware acceleration or CPU as a
/// fallback.
#[derive(Debug)]
pub struct ImageProcessor {
    /// CPU-based image converter as a fallback. This is only None if the
    /// EDGEFIRST_DISABLE_CPU environment variable is set.
    pub cpu: Option<CPUProcessor>,

    #[cfg(target_os = "linux")]
    /// G2D-based image converter for Linux systems. This is only available if
    /// the EDGEFIRST_DISABLE_G2D environment variable is not set and libg2d.so
    /// is available.
    pub g2d: Option<G2DProcessor>,
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    /// OpenGL-based image converter for Linux systems. This is only available
    /// if the EDGEFIRST_DISABLE_GL environment variable is not set and OpenGL
    /// ES is available.
    pub opengl: Option<GLProcessorThreaded>,

    /// When set, only the specified backend is used — no fallback chain.
    pub(crate) forced_backend: Option<ForcedBackend>,
}

unsafe impl Send for ImageProcessor {}
unsafe impl Sync for ImageProcessor {}

impl ImageProcessor {
    /// Creates a new `ImageProcessor` instance, initializing available
    /// hardware converters based on the system capabilities and environment
    /// variables.
    ///
    /// # Examples
    /// ```rust
    /// # use edgefirst_image::{ImageProcessor, Rotation, Flip, Crop, ImageProcessorTrait, load_image};
    /// # use edgefirst_tensor::{PixelFormat, DType, TensorDyn};
    /// # fn main() -> Result<(), edgefirst_image::Error> {
    /// let image = include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/../../testdata/zidane.jpg"));
    /// let src = load_image(image, Some(PixelFormat::Rgba), None)?;
    /// let mut converter = ImageProcessor::new()?;
    /// let mut dst = converter.create_image(640, 480, PixelFormat::Rgb, DType::U8, None)?;
    /// converter.convert(&src, &mut dst, Rotation::None, Flip::None, Crop::default())?;
    /// # Ok(())
    /// # }
    /// ```
    pub fn new() -> Result<Self> {
        Self::with_config(ImageProcessorConfig::default())
    }

    /// Creates a new `ImageProcessor` with the given configuration.
    ///
    /// When [`ImageProcessorConfig::backend`] is set to a specific backend,
    /// environment variables are ignored and the processor initializes the
    /// requested backend plus CPU as a fallback.
    ///
    /// When `Auto`, the existing `EDGEFIRST_FORCE_BACKEND` and
    /// `EDGEFIRST_DISABLE_*` environment variables apply.
    #[allow(unused_variables)]
    pub fn with_config(config: ImageProcessorConfig) -> Result<Self> {
        // ── Config-driven backend selection ──────────────────────────
        // When the caller explicitly requests a backend via the config,
        // skip all environment variable logic.
        match config.backend {
            ComputeBackend::Cpu => {
                log::info!("ComputeBackend::Cpu — CPU only");
                return Ok(Self {
                    cpu: Some(CPUProcessor::new()),
                    #[cfg(target_os = "linux")]
                    g2d: None,
                    #[cfg(target_os = "linux")]
                    #[cfg(feature = "opengl")]
                    opengl: None,
                    forced_backend: None,
                });
            }
            ComputeBackend::G2d => {
                log::info!("ComputeBackend::G2d — G2D + CPU fallback");
                #[cfg(target_os = "linux")]
                {
                    let g2d = match G2DProcessor::new() {
                        Ok(g) => Some(g),
                        Err(e) => {
                            log::warn!("G2D requested but failed to initialize: {e:?}");
                            None
                        }
                    };
                    return Ok(Self {
                        cpu: Some(CPUProcessor::new()),
                        g2d,
                        #[cfg(feature = "opengl")]
                        opengl: None,
                        forced_backend: None,
                    });
                }
                #[cfg(not(target_os = "linux"))]
                {
                    log::warn!("G2D requested but not available on this platform, using CPU");
                    return Ok(Self {
                        cpu: Some(CPUProcessor::new()),
                        forced_backend: None,
                    });
                }
            }
            ComputeBackend::OpenGl => {
                log::info!("ComputeBackend::OpenGl — OpenGL + CPU fallback");
                #[cfg(target_os = "linux")]
                {
                    #[cfg(feature = "opengl")]
                    let opengl = match GLProcessorThreaded::new(config.egl_display) {
                        Ok(gl) => Some(gl),
                        Err(e) => {
                            log::warn!("OpenGL requested but failed to initialize: {e:?}");
                            None
                        }
                    };
                    return Ok(Self {
                        cpu: Some(CPUProcessor::new()),
                        g2d: None,
                        #[cfg(feature = "opengl")]
                        opengl,
                        forced_backend: None,
                    });
                }
                #[cfg(not(target_os = "linux"))]
                {
                    log::warn!("OpenGL requested but not available on this platform, using CPU");
                    return Ok(Self {
                        cpu: Some(CPUProcessor::new()),
                        forced_backend: None,
                    });
                }
            }
            ComputeBackend::Auto => { /* fall through to env-var logic below */ }
        }

        // ── EDGEFIRST_FORCE_BACKEND ──────────────────────────────────
        // When set, only the requested backend is initialised and no
        // fallback chain is used. Accepted values (case-insensitive):
        //   "cpu", "g2d", "opengl"
        if let Ok(val) = std::env::var("EDGEFIRST_FORCE_BACKEND") {
            let val_lower = val.to_lowercase();
            let forced = match val_lower.as_str() {
                "cpu" => ForcedBackend::Cpu,
                "g2d" => ForcedBackend::G2d,
                "opengl" => ForcedBackend::OpenGl,
                other => {
                    return Err(Error::ForcedBackendUnavailable(format!(
                        "unknown EDGEFIRST_FORCE_BACKEND value: {other:?} (expected cpu, g2d, or opengl)"
                    )));
                }
            };

            log::info!("EDGEFIRST_FORCE_BACKEND={val} — only initializing {val_lower} backend");

            return match forced {
                ForcedBackend::Cpu => Ok(Self {
                    cpu: Some(CPUProcessor::new()),
                    #[cfg(target_os = "linux")]
                    g2d: None,
                    #[cfg(target_os = "linux")]
                    #[cfg(feature = "opengl")]
                    opengl: None,
                    forced_backend: Some(ForcedBackend::Cpu),
                }),
                ForcedBackend::G2d => {
                    #[cfg(target_os = "linux")]
                    {
                        let g2d = G2DProcessor::new().map_err(|e| {
                            Error::ForcedBackendUnavailable(format!(
                                "g2d forced but failed to initialize: {e:?}"
                            ))
                        })?;
                        Ok(Self {
                            cpu: None,
                            g2d: Some(g2d),
                            #[cfg(feature = "opengl")]
                            opengl: None,
                            forced_backend: Some(ForcedBackend::G2d),
                        })
                    }
                    #[cfg(not(target_os = "linux"))]
                    {
                        Err(Error::ForcedBackendUnavailable(
                            "g2d backend is only available on Linux".into(),
                        ))
                    }
                }
                ForcedBackend::OpenGl => {
                    #[cfg(target_os = "linux")]
                    #[cfg(feature = "opengl")]
                    {
                        let opengl = GLProcessorThreaded::new(config.egl_display).map_err(|e| {
                            Error::ForcedBackendUnavailable(format!(
                                "opengl forced but failed to initialize: {e:?}"
                            ))
                        })?;
                        Ok(Self {
                            cpu: None,
                            g2d: None,
                            opengl: Some(opengl),
                            forced_backend: Some(ForcedBackend::OpenGl),
                        })
                    }
                    #[cfg(not(all(target_os = "linux", feature = "opengl")))]
                    {
                        Err(Error::ForcedBackendUnavailable(
                            "opengl backend requires Linux with the 'opengl' feature enabled"
                                .into(),
                        ))
                    }
                }
            };
        }

        // ── Existing DISABLE logic (unchanged) ──────────────────────
        #[cfg(target_os = "linux")]
        let g2d = if std::env::var("EDGEFIRST_DISABLE_G2D")
            .map(|x| x != "0" && x.to_lowercase() != "false")
            .unwrap_or(false)
        {
            log::debug!("EDGEFIRST_DISABLE_G2D is set");
            None
        } else {
            match G2DProcessor::new() {
                Ok(g2d_converter) => Some(g2d_converter),
                Err(err) => {
                    log::warn!("Failed to initialize G2D converter: {err:?}");
                    None
                }
            }
        };

        #[cfg(target_os = "linux")]
        #[cfg(feature = "opengl")]
        let opengl = if std::env::var("EDGEFIRST_DISABLE_GL")
            .map(|x| x != "0" && x.to_lowercase() != "false")
            .unwrap_or(false)
        {
            log::debug!("EDGEFIRST_DISABLE_GL is set");
            None
        } else {
            match GLProcessorThreaded::new(config.egl_display) {
                Ok(gl_converter) => Some(gl_converter),
                Err(err) => {
                    log::warn!("Failed to initialize GL converter: {err:?}");
                    None
                }
            }
        };

        let cpu = if std::env::var("EDGEFIRST_DISABLE_CPU")
            .map(|x| x != "0" && x.to_lowercase() != "false")
            .unwrap_or(false)
        {
            log::debug!("EDGEFIRST_DISABLE_CPU is set");
            None
        } else {
            Some(CPUProcessor::new())
        };
        Ok(Self {
            cpu,
            #[cfg(target_os = "linux")]
            g2d,
            #[cfg(target_os = "linux")]
            #[cfg(feature = "opengl")]
            opengl,
            forced_backend: None,
        })
    }

    /// Sets the interpolation mode for int8 proto textures on the OpenGL
    /// backend. No-op if OpenGL is not available.
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    pub fn set_int8_interpolation_mode(&mut self, mode: Int8InterpolationMode) -> Result<()> {
        if let Some(ref mut gl) = self.opengl {
            gl.set_int8_interpolation_mode(mode)?;
        }
        Ok(())
    }

    /// Create a [`TensorDyn`] image with the best available memory backend.
    ///
    /// Priority: DMA-buf → PBO (byte-sized types: u8, i8) → system memory.
    ///
    /// Use this method instead of [`TensorDyn::image()`] when the tensor will
    /// be used with [`ImageProcessor::convert()`]. It selects the optimal
    /// memory backing (including PBO for GPU zero-copy) which direct
    /// allocation cannot achieve.
    ///
    /// This method is on [`ImageProcessor`] rather than [`ImageProcessorTrait`]
    /// because optimal allocation requires knowledge of the active compute
    /// backends (e.g. the GL context handle for PBO allocation). Individual
    /// backend implementations ([`CPUProcessor`], etc.) do not have this
    /// cross-backend visibility.
    ///
    /// # Arguments
    ///
    /// * `width` - Image width in pixels
    /// * `height` - Image height in pixels
    /// * `format` - Pixel format
    /// * `dtype` - Element data type (e.g. `DType::U8`, `DType::I8`)
    /// * `memory` - Optional memory type override; when `None`, the best
    ///   available backend is selected automatically.
    ///
    /// # Returns
    ///
    /// A [`TensorDyn`] backed by the highest-performance memory type
    /// available on this system.
    ///
    /// # Errors
    ///
    /// Returns an error if all allocation strategies fail.
    pub fn create_image(
        &self,
        width: usize,
        height: usize,
        format: PixelFormat,
        dtype: DType,
        memory: Option<TensorMemory>,
    ) -> Result<TensorDyn> {
        // If an explicit memory type is requested, honour it directly.
        if let Some(mem) = memory {
            return Ok(TensorDyn::image(width, height, format, dtype, Some(mem))?);
        }

        // Try DMA first on Linux — skip only when GL has explicitly selected PBO
        // as the preferred transfer path (PBO is better than DMA in that case).
        #[cfg(target_os = "linux")]
        {
            #[cfg(feature = "opengl")]
            let gl_uses_pbo = self
                .opengl
                .as_ref()
                .is_some_and(|gl| gl.transfer_backend() == opengl_headless::TransferBackend::Pbo);
            #[cfg(not(feature = "opengl"))]
            let gl_uses_pbo = false;

            if !gl_uses_pbo {
                if let Ok(img) = TensorDyn::image(
                    width,
                    height,
                    format,
                    dtype,
                    Some(edgefirst_tensor::TensorMemory::Dma),
                ) {
                    return Ok(img);
                }
            }
        }

        // Try PBO (if GL available).
        // PBO buffers are u8-sized; the int8 shader emulates i8 output via
        // XOR 0x80 on the same underlying buffer, so both U8 and I8 work.
        #[cfg(target_os = "linux")]
        #[cfg(feature = "opengl")]
        if dtype.size() == 1 {
            if let Some(gl) = &self.opengl {
                match gl.create_pbo_image(width, height, format) {
                    Ok(t) => {
                        if dtype == DType::I8 {
                            // SAFETY: Tensor<u8> and Tensor<i8> are layout-
                            // identical (same element size, no T-dependent
                            // drop glue). The int8 shader applies XOR 0x80
                            // on the same PBO buffer. Same rationale as
                            // gl::processor::tensor_i8_as_u8_mut.
                            // Invariant: PBO tensors never have chroma
                            // (create_pbo_image → Tensor::wrap sets it None).
                            debug_assert!(
                                t.chroma().is_none(),
                                "PBO i8 transmute requires chroma == None"
                            );
                            let t_i8: Tensor<i8> = unsafe { std::mem::transmute(t) };
                            return Ok(TensorDyn::from(t_i8));
                        }
                        return Ok(TensorDyn::from(t));
                    }
                    Err(e) => log::debug!("PBO image creation failed, falling back to Mem: {e:?}"),
                }
            }
        }

        // Fallback to Mem
        Ok(TensorDyn::image(
            width,
            height,
            format,
            dtype,
            Some(edgefirst_tensor::TensorMemory::Mem),
        )?)
    }

    /// Import an external DMA-BUF image.
    ///
    /// Each [`PlaneDescriptor`] owns an already-duped fd; this method
    /// consumes the descriptors and takes ownership of those fds (whether
    /// the call succeeds or fails).
    ///
    /// The caller must ensure the DMA-BUF allocation is large enough for the
    /// specified width, height, format, and any stride/offset on the plane
    /// descriptors. No buffer-size validation is performed; an undersized
    /// buffer may cause GPU faults or EGL import failure.
    ///
    /// # Arguments
    ///
    /// * `image` - Plane descriptor for the primary (or only) plane
    /// * `chroma` - Optional plane descriptor for the UV chroma plane
    ///   (required for multiplane NV12)
    /// * `width` - Image width in pixels
    /// * `height` - Image height in pixels
    /// * `format` - Pixel format of the buffer
    /// * `dtype` - Element data type (e.g. `DType::U8`)
    ///
    /// # Returns
    ///
    /// A `TensorDyn` configured as an image.
    ///
    /// # Errors
    ///
    /// * [`Error::NotSupported`] if `chroma` is `Some` for a non-semi-planar
    ///   format, or multiplane NV16 (not yet supported), or the fd is not
    ///   DMA-backed
    /// * [`Error::InvalidShape`] if NV12 height is odd
    ///
    /// # Platform
    ///
    /// Linux only.
    ///
    /// # Examples
    ///
    /// ```rust,ignore
    /// use edgefirst_tensor::PlaneDescriptor;
    ///
    /// // Single-plane RGBA
    /// let pd = PlaneDescriptor::new(fd.as_fd())?;
    /// let src = proc.import_image(pd, None, 1920, 1080, PixelFormat::Rgba, DType::U8)?;
    ///
    /// // Multi-plane NV12 with stride
    /// let y_pd = PlaneDescriptor::new(y_fd.as_fd())?.with_stride(2048);
    /// let uv_pd = PlaneDescriptor::new(uv_fd.as_fd())?.with_stride(2048);
    /// let src = proc.import_image(y_pd, Some(uv_pd), 1920, 1080,
    ///                             PixelFormat::Nv12, DType::U8)?;
    /// ```
    #[cfg(target_os = "linux")]
    pub fn import_image(
        &self,
        image: edgefirst_tensor::PlaneDescriptor,
        chroma: Option<edgefirst_tensor::PlaneDescriptor>,
        width: usize,
        height: usize,
        format: PixelFormat,
        dtype: DType,
    ) -> Result<TensorDyn> {
        use edgefirst_tensor::{Tensor, TensorMemory};

        // Capture stride/offset from descriptors before consuming them
        let image_stride = image.stride();
        let image_offset = image.offset();
        let chroma_stride = chroma.as_ref().and_then(|c| c.stride());
        let chroma_offset = chroma.as_ref().and_then(|c| c.offset());

        if let Some(chroma_pd) = chroma {
            // ── Multiplane path ──────────────────────────────────────
            // Multiplane tensors are backed by Tensor<u8> (or transmuted to
            // Tensor<i8>). Reject other dtypes to avoid silently returning a
            // tensor with the wrong element type.
            if dtype != DType::U8 && dtype != DType::I8 {
                return Err(Error::NotSupported(format!(
                    "multiplane import only supports U8/I8, got {dtype:?}"
                )));
            }
            if format.layout() != PixelLayout::SemiPlanar {
                return Err(Error::NotSupported(format!(
                    "import_image with chroma requires a semi-planar format, got {format:?}"
                )));
            }

            let chroma_h = match format {
                PixelFormat::Nv12 => {
                    if !height.is_multiple_of(2) {
                        return Err(Error::InvalidShape(format!(
                            "NV12 requires even height, got {height}"
                        )));
                    }
                    height / 2
                }
                // NV16 multiplane will be supported in a future release;
                // the GL backend currently only handles NV12 plane1 attributes.
                PixelFormat::Nv16 => {
                    return Err(Error::NotSupported(
                        "multiplane NV16 is not yet supported; use contiguous NV16 instead".into(),
                    ))
                }
                _ => {
                    return Err(Error::NotSupported(format!(
                        "unsupported semi-planar format: {format:?}"
                    )))
                }
            };

            let luma = Tensor::<u8>::from_fd(image.into_fd(), &[height, width], Some("luma"))?;
            if luma.memory() != TensorMemory::Dma {
                return Err(Error::NotSupported(format!(
                    "luma fd must be DMA-backed, got {:?}",
                    luma.memory()
                )));
            }

            let chroma_tensor =
                Tensor::<u8>::from_fd(chroma_pd.into_fd(), &[chroma_h, width], Some("chroma"))?;
            if chroma_tensor.memory() != TensorMemory::Dma {
                return Err(Error::NotSupported(format!(
                    "chroma fd must be DMA-backed, got {:?}",
                    chroma_tensor.memory()
                )));
            }

            // from_planes creates the combined tensor with format set,
            // preserving luma's row_stride (currently None since luma was raw).
            let mut tensor = Tensor::<u8>::from_planes(luma, chroma_tensor, format)?;

            // Apply stride/offset to the combined tensor (luma plane)
            if let Some(s) = image_stride {
                tensor.set_row_stride(s)?;
            }
            if let Some(o) = image_offset {
                tensor.set_plane_offset(o);
            }

            // Apply stride/offset to the chroma sub-tensor.
            // The chroma tensor is a raw 2D [chroma_h, width] tensor without
            // format metadata, so we validate stride manually rather than
            // using set_row_stride (which requires format).
            if let Some(chroma_ref) = tensor.chroma_mut() {
                if let Some(s) = chroma_stride {
                    if s < width {
                        return Err(Error::InvalidShape(format!(
                            "chroma stride {s} < minimum {width} for {format:?}"
                        )));
                    }
                    chroma_ref.set_row_stride_unchecked(s);
                }
                if let Some(o) = chroma_offset {
                    chroma_ref.set_plane_offset(o);
                }
            }

            if dtype == DType::I8 {
                // SAFETY: Tensor<u8> and Tensor<i8> have identical layout because
                // the struct contains only type-erased storage (OwnedFd, shape, name),
                // no inline T values. This assertion catches layout drift at compile time.
                const {
                    assert!(std::mem::size_of::<Tensor<u8>>() == std::mem::size_of::<Tensor<i8>>());
                    assert!(
                        std::mem::align_of::<Tensor<u8>>() == std::mem::align_of::<Tensor<i8>>()
                    );
                }
                let tensor_i8: Tensor<i8> = unsafe { std::mem::transmute(tensor) };
                return Ok(TensorDyn::from(tensor_i8));
            }
            Ok(TensorDyn::from(tensor))
        } else {
            // ── Single-plane path ────────────────────────────────────
            let shape = match format.layout() {
                PixelLayout::Packed => vec![height, width, format.channels()],
                PixelLayout::Planar => vec![format.channels(), height, width],
                PixelLayout::SemiPlanar => {
                    let total_h = match format {
                        PixelFormat::Nv12 => {
                            if !height.is_multiple_of(2) {
                                return Err(Error::InvalidShape(format!(
                                    "NV12 requires even height, got {height}"
                                )));
                            }
                            height * 3 / 2
                        }
                        PixelFormat::Nv16 => height * 2,
                        _ => {
                            return Err(Error::InvalidShape(format!(
                                "unknown semi-planar height multiplier for {format:?}"
                            )))
                        }
                    };
                    vec![total_h, width]
                }
                _ => {
                    return Err(Error::NotSupported(format!(
                        "unsupported pixel layout for import_image: {:?}",
                        format.layout()
                    )));
                }
            };
            let tensor = TensorDyn::from_fd(image.into_fd(), &shape, dtype, None)?;
            if tensor.memory() != TensorMemory::Dma {
                return Err(Error::NotSupported(format!(
                    "import_image requires DMA-backed fd, got {:?}",
                    tensor.memory()
                )));
            }
            let mut tensor = tensor.with_format(format)?;
            if let Some(s) = image_stride {
                tensor.set_row_stride(s)?;
            }
            if let Some(o) = image_offset {
                tensor.set_plane_offset(o);
            }
            Ok(tensor)
        }
    }
}

impl ImageProcessorTrait for ImageProcessor {
    /// Converts the source image to the destination image format and size. The
    /// image is cropped first, then flipped, then rotated
    ///
    /// Prefer hardware accelerators when available, falling back to CPU if
    /// necessary.
    fn convert(
        &mut self,
        src: &TensorDyn,
        dst: &mut TensorDyn,
        rotation: Rotation,
        flip: Flip,
        crop: Crop,
    ) -> Result<()> {
        let start = Instant::now();
        let src_fmt = src.format();
        let dst_fmt = dst.format();
        log::trace!(
            "convert: {src_fmt:?}({:?}/{:?}) → {dst_fmt:?}({:?}/{:?}), \
             rotation={rotation:?}, flip={flip:?}, backend={:?}",
            src.dtype(),
            src.memory(),
            dst.dtype(),
            dst.memory(),
            self.forced_backend,
        );

        // ── Forced backend: no fallback chain ────────────────────────
        if let Some(forced) = self.forced_backend {
            return match forced {
                ForcedBackend::Cpu => {
                    if let Some(cpu) = self.cpu.as_mut() {
                        let r = cpu.convert(src, dst, rotation, flip, crop);
                        log::trace!(
                            "convert: forced=cpu result={} ({:?})",
                            if r.is_ok() { "ok" } else { "err" },
                            start.elapsed()
                        );
                        return r;
                    }
                    Err(Error::ForcedBackendUnavailable("cpu".into()))
                }
                ForcedBackend::G2d => {
                    #[cfg(target_os = "linux")]
                    if let Some(g2d) = self.g2d.as_mut() {
                        let r = g2d.convert(src, dst, rotation, flip, crop);
                        log::trace!(
                            "convert: forced=g2d result={} ({:?})",
                            if r.is_ok() { "ok" } else { "err" },
                            start.elapsed()
                        );
                        return r;
                    }
                    Err(Error::ForcedBackendUnavailable("g2d".into()))
                }
                ForcedBackend::OpenGl => {
                    #[cfg(target_os = "linux")]
                    #[cfg(feature = "opengl")]
                    if let Some(opengl) = self.opengl.as_mut() {
                        let r = opengl.convert(src, dst, rotation, flip, crop);
                        log::trace!(
                            "convert: forced=opengl result={} ({:?})",
                            if r.is_ok() { "ok" } else { "err" },
                            start.elapsed()
                        );
                        return r;
                    }
                    Err(Error::ForcedBackendUnavailable("opengl".into()))
                }
            };
        }

        // ── Auto fallback chain: OpenGL → G2D → CPU ──────────────────
        #[cfg(target_os = "linux")]
        #[cfg(feature = "opengl")]
        if let Some(opengl) = self.opengl.as_mut() {
            match opengl.convert(src, dst, rotation, flip, crop) {
                Ok(_) => {
                    log::trace!(
                        "convert: auto selected=opengl for {src_fmt:?}→{dst_fmt:?} ({:?})",
                        start.elapsed()
                    );
                    return Ok(());
                }
                Err(e) => {
                    log::trace!("convert: auto opengl declined {src_fmt:?}→{dst_fmt:?}: {e}");
                }
            }
        }

        #[cfg(target_os = "linux")]
        if let Some(g2d) = self.g2d.as_mut() {
            match g2d.convert(src, dst, rotation, flip, crop) {
                Ok(_) => {
                    log::trace!(
                        "convert: auto selected=g2d for {src_fmt:?}→{dst_fmt:?} ({:?})",
                        start.elapsed()
                    );
                    return Ok(());
                }
                Err(e) => {
                    log::trace!("convert: auto g2d declined {src_fmt:?}→{dst_fmt:?}: {e}");
                }
            }
        }

        if let Some(cpu) = self.cpu.as_mut() {
            match cpu.convert(src, dst, rotation, flip, crop) {
                Ok(_) => {
                    log::trace!(
                        "convert: auto selected=cpu for {src_fmt:?}→{dst_fmt:?} ({:?})",
                        start.elapsed()
                    );
                    return Ok(());
                }
                Err(e) => {
                    log::trace!("convert: auto cpu failed {src_fmt:?}→{dst_fmt:?}: {e}");
                    return Err(e);
                }
            }
        }
        Err(Error::NoConverter)
    }

    fn draw_masks(
        &mut self,
        dst: &mut TensorDyn,
        detect: &[DetectBox],
        segmentation: &[Segmentation],
    ) -> Result<()> {
        let start = Instant::now();

        if detect.is_empty() && segmentation.is_empty() {
            return Ok(());
        }

        // ── Forced backend: no fallback chain ────────────────────────
        if let Some(forced) = self.forced_backend {
            return match forced {
                ForcedBackend::Cpu => {
                    if let Some(cpu) = self.cpu.as_mut() {
                        return cpu.draw_masks(dst, detect, segmentation);
                    }
                    Err(Error::ForcedBackendUnavailable("cpu".into()))
                }
                ForcedBackend::G2d => Err(Error::NotSupported(
                    "g2d does not support draw_masks".into(),
                )),
                ForcedBackend::OpenGl => {
                    #[cfg(target_os = "linux")]
                    #[cfg(feature = "opengl")]
                    if let Some(opengl) = self.opengl.as_mut() {
                        return opengl.draw_masks(dst, detect, segmentation);
                    }
                    Err(Error::ForcedBackendUnavailable("opengl".into()))
                }
            };
        }

        // skip G2D as it doesn't support rendering to image

        #[cfg(target_os = "linux")]
        #[cfg(feature = "opengl")]
        if let Some(opengl) = self.opengl.as_mut() {
            log::trace!("draw_masks started with opengl in {:?}", start.elapsed());
            match opengl.draw_masks(dst, detect, segmentation) {
                Ok(_) => {
                    log::trace!("draw_masks with opengl in {:?}", start.elapsed());
                    return Ok(());
                }
                Err(e) => {
                    log::trace!("draw_masks didn't work with opengl: {e:?}")
                }
            }
        }
        log::trace!("draw_masks started with cpu in {:?}", start.elapsed());
        if let Some(cpu) = self.cpu.as_mut() {
            match cpu.draw_masks(dst, detect, segmentation) {
                Ok(_) => {
                    log::trace!("draw_masks with cpu in {:?}", start.elapsed());
                    return Ok(());
                }
                Err(e) => {
                    log::trace!("draw_masks didn't work with cpu: {e:?}");
                    return Err(e);
                }
            }
        }
        Err(Error::NoConverter)
    }

    fn draw_masks_proto(
        &mut self,
        dst: &mut TensorDyn,
        detect: &[DetectBox],
        proto_data: &ProtoData,
    ) -> Result<()> {
        let start = Instant::now();

        if detect.is_empty() {
            return Ok(());
        }

        // ── Forced backend: no fallback chain ────────────────────────
        if let Some(forced) = self.forced_backend {
            return match forced {
                ForcedBackend::Cpu => {
                    if let Some(cpu) = self.cpu.as_mut() {
                        return cpu.draw_masks_proto(dst, detect, proto_data);
                    }
                    Err(Error::ForcedBackendUnavailable("cpu".into()))
                }
                ForcedBackend::G2d => Err(Error::NotSupported(
                    "g2d does not support draw_masks_proto".into(),
                )),
                ForcedBackend::OpenGl => {
                    #[cfg(target_os = "linux")]
                    #[cfg(feature = "opengl")]
                    if let Some(opengl) = self.opengl.as_mut() {
                        return opengl.draw_masks_proto(dst, detect, proto_data);
                    }
                    Err(Error::ForcedBackendUnavailable("opengl".into()))
                }
            };
        }

        // skip G2D as it doesn't support rendering to image

        // Hybrid path: CPU materialize + GL overlay (benchmarked faster than
        // full-GPU draw_masks_proto on all tested platforms: 27× on imx8mp,
        // 4× on imx95, 2.5× on rpi5, 1.6× on x86).
        #[cfg(target_os = "linux")]
        #[cfg(feature = "opengl")]
        if let Some(opengl) = self.opengl.as_mut() {
            let Some(cpu) = self.cpu.as_ref() else {
                return Err(Error::Internal(
                    "draw_masks_proto requires CPU backend for hybrid path".into(),
                ));
            };
            log::trace!(
                "draw_masks_proto started with hybrid (cpu+opengl) in {:?}",
                start.elapsed()
            );
            let segmentation = cpu.materialize_segmentations(detect, proto_data)?;
            match opengl.draw_masks(dst, detect, &segmentation) {
                Ok(_) => {
                    log::trace!(
                        "draw_masks_proto with hybrid (cpu+opengl) in {:?}",
                        start.elapsed()
                    );
                    return Ok(());
                }
                Err(e) => {
                    log::trace!("draw_masks_proto hybrid path failed, falling back to cpu: {e:?}");
                }
            }
        }

        // CPU-only fallback (no OpenGL, or hybrid GL overlay failed)
        let Some(cpu) = self.cpu.as_mut() else {
            return Err(Error::Internal(
                "draw_masks_proto requires CPU backend for fallback path".into(),
            ));
        };
        log::trace!("draw_masks_proto started with cpu in {:?}", start.elapsed());
        cpu.draw_masks_proto(dst, detect, proto_data)
    }

    fn set_class_colors(&mut self, colors: &[[u8; 4]]) -> Result<()> {
        let start = Instant::now();

        // ── Forced backend: no fallback chain ────────────────────────
        if let Some(forced) = self.forced_backend {
            return match forced {
                ForcedBackend::Cpu => {
                    if let Some(cpu) = self.cpu.as_mut() {
                        return cpu.set_class_colors(colors);
                    }
                    Err(Error::ForcedBackendUnavailable("cpu".into()))
                }
                ForcedBackend::G2d => Err(Error::NotSupported(
                    "g2d does not support set_class_colors".into(),
                )),
                ForcedBackend::OpenGl => {
                    #[cfg(target_os = "linux")]
                    #[cfg(feature = "opengl")]
                    if let Some(opengl) = self.opengl.as_mut() {
                        return opengl.set_class_colors(colors);
                    }
                    Err(Error::ForcedBackendUnavailable("opengl".into()))
                }
            };
        }

        // skip G2D as it doesn't support rendering to image

        #[cfg(target_os = "linux")]
        #[cfg(feature = "opengl")]
        if let Some(opengl) = self.opengl.as_mut() {
            log::trace!("image started with opengl in {:?}", start.elapsed());
            match opengl.set_class_colors(colors) {
                Ok(_) => {
                    log::trace!("colors set with opengl in {:?}", start.elapsed());
                    return Ok(());
                }
                Err(e) => {
                    log::trace!("colors didn't set with opengl: {e:?}")
                }
            }
        }
        log::trace!("image started with cpu in {:?}", start.elapsed());
        if let Some(cpu) = self.cpu.as_mut() {
            match cpu.set_class_colors(colors) {
                Ok(_) => {
                    log::trace!("colors set with cpu in {:?}", start.elapsed());
                    return Ok(());
                }
                Err(e) => {
                    log::trace!("colors didn't set with cpu: {e:?}");
                    return Err(e);
                }
            }
        }
        Err(Error::NoConverter)
    }

    fn decode_masks_atlas(
        &mut self,
        detect: &[DetectBox],
        proto_data: ProtoData,
        output_width: usize,
        output_height: usize,
    ) -> Result<(Vec<u8>, Vec<MaskRegion>)> {
        if detect.is_empty() {
            return Ok((Vec::new(), Vec::new()));
        }

        // ── Forced backend: no fallback chain ────────────────────────
        if let Some(forced) = self.forced_backend {
            return match forced {
                ForcedBackend::Cpu => {
                    if let Some(cpu) = self.cpu.as_mut() {
                        return cpu.decode_masks_atlas(
                            detect,
                            proto_data,
                            output_width,
                            output_height,
                        );
                    }
                    Err(Error::ForcedBackendUnavailable("cpu".into()))
                }
                ForcedBackend::G2d => Err(Error::NotSupported(
                    "g2d does not support decode_masks_atlas".into(),
                )),
                ForcedBackend::OpenGl => {
                    #[cfg(target_os = "linux")]
                    #[cfg(feature = "opengl")]
                    if let Some(opengl) = self.opengl.as_mut() {
                        return opengl.decode_masks_atlas(
                            detect,
                            proto_data,
                            output_width,
                            output_height,
                        );
                    }
                    Err(Error::ForcedBackendUnavailable("opengl".into()))
                }
            };
        }

        #[cfg(target_os = "linux")]
        #[cfg(feature = "opengl")]
        {
            let has_opengl = self.opengl.is_some();
            if has_opengl {
                let opengl = self.opengl.as_mut().unwrap();
                match opengl.decode_masks_atlas(detect, proto_data, output_width, output_height) {
                    Ok(r) => return Ok(r),
                    Err(e) => {
                        log::trace!("decode_masks_atlas didn't work with opengl: {e:?}");
                        return Err(e);
                    }
                }
            }
        }
        // CPU fallback: render per-detection masks and pack into compact atlas
        if let Some(cpu) = self.cpu.as_mut() {
            return cpu.decode_masks_atlas(detect, proto_data, output_width, output_height);
        }
        Err(Error::NoConverter)
    }
}

// ---------------------------------------------------------------------------
// Image loading / saving helpers
// ---------------------------------------------------------------------------

/// Read EXIF orientation from raw EXIF bytes and return (Rotation, Flip).
fn read_exif_orientation(exif_bytes: &[u8]) -> (Rotation, Flip) {
    let exifreader = exif::Reader::new();
    let Ok(exif_) = exifreader.read_raw(exif_bytes.to_vec()) else {
        return (Rotation::None, Flip::None);
    };
    let Some(orientation) = exif_.get_field(exif::Tag::Orientation, exif::In::PRIMARY) else {
        return (Rotation::None, Flip::None);
    };
    match orientation.value.get_uint(0) {
        Some(1) => (Rotation::None, Flip::None),
        Some(2) => (Rotation::None, Flip::Horizontal),
        Some(3) => (Rotation::Rotate180, Flip::None),
        Some(4) => (Rotation::Rotate180, Flip::Horizontal),
        Some(5) => (Rotation::Clockwise90, Flip::Horizontal),
        Some(6) => (Rotation::Clockwise90, Flip::None),
        Some(7) => (Rotation::CounterClockwise90, Flip::Horizontal),
        Some(8) => (Rotation::CounterClockwise90, Flip::None),
        Some(v) => {
            log::warn!("broken orientation EXIF value: {v}");
            (Rotation::None, Flip::None)
        }
        None => (Rotation::None, Flip::None),
    }
}

/// Map a [`PixelFormat`] to the zune-jpeg `ColorSpace` for decoding.
/// Returns `None` for formats that the JPEG decoder cannot output directly.
fn pixelfmt_to_colorspace(fmt: PixelFormat) -> Option<ColorSpace> {
    match fmt {
        PixelFormat::Rgb => Some(ColorSpace::RGB),
        PixelFormat::Rgba => Some(ColorSpace::RGBA),
        PixelFormat::Grey => Some(ColorSpace::Luma),
        _ => None,
    }
}

/// Map a zune-jpeg `ColorSpace` to a [`PixelFormat`].
fn colorspace_to_pixelfmt(cs: ColorSpace) -> Option<PixelFormat> {
    match cs {
        ColorSpace::RGB => Some(PixelFormat::Rgb),
        ColorSpace::RGBA => Some(PixelFormat::Rgba),
        ColorSpace::Luma => Some(PixelFormat::Grey),
        _ => None,
    }
}

/// Load a JPEG image from raw bytes and return a [`TensorDyn`].
fn load_jpeg(
    image: &[u8],
    format: Option<PixelFormat>,
    memory: Option<TensorMemory>,
) -> Result<TensorDyn> {
    let colour = match format {
        Some(f) => pixelfmt_to_colorspace(f)
            .ok_or_else(|| Error::NotSupported(format!("Unsupported image format {f:?}")))?,
        None => ColorSpace::RGB,
    };
    let options = DecoderOptions::default().jpeg_set_out_colorspace(colour);
    let mut decoder = JpegDecoder::new_with_options(image, options);
    decoder.decode_headers()?;

    let image_info = decoder.info().ok_or(Error::Internal(
        "JPEG did not return decoded image info".to_string(),
    ))?;

    let converted_cs = decoder
        .get_output_colorspace()
        .ok_or(Error::Internal("No output colorspace".to_string()))?;

    let converted_fmt = colorspace_to_pixelfmt(converted_cs).ok_or(Error::NotSupported(
        "Unsupported JPEG decoder output".to_string(),
    ))?;

    let dest_fmt = format.unwrap_or(converted_fmt);

    let (rotation, flip) = decoder
        .exif()
        .map(|x| read_exif_orientation(x))
        .unwrap_or((Rotation::None, Flip::None));

    let w = image_info.width as usize;
    let h = image_info.height as usize;

    if (rotation, flip) == (Rotation::None, Flip::None) {
        let mut img = Tensor::<u8>::image(w, h, dest_fmt, memory)?;

        if converted_fmt != dest_fmt {
            let tmp = Tensor::<u8>::image(w, h, converted_fmt, Some(TensorMemory::Mem))?;
            decoder.decode_into(&mut tmp.map()?)?;
            CPUProcessor::convert_format_pf(&tmp, &mut img, converted_fmt, dest_fmt)?;
            return Ok(TensorDyn::from(img));
        }
        decoder.decode_into(&mut img.map()?)?;
        return Ok(TensorDyn::from(img));
    }

    let mut tmp = Tensor::<u8>::image(w, h, dest_fmt, Some(TensorMemory::Mem))?;

    if converted_fmt != dest_fmt {
        let tmp2 = Tensor::<u8>::image(w, h, converted_fmt, Some(TensorMemory::Mem))?;
        decoder.decode_into(&mut tmp2.map()?)?;
        CPUProcessor::convert_format_pf(&tmp2, &mut tmp, converted_fmt, dest_fmt)?;
    } else {
        decoder.decode_into(&mut tmp.map()?)?;
    }

    rotate_flip_to_dyn(&tmp, dest_fmt, rotation, flip, memory)
}

/// Load a PNG image from raw bytes and return a [`TensorDyn`].
fn load_png(
    image: &[u8],
    format: Option<PixelFormat>,
    memory: Option<TensorMemory>,
) -> Result<TensorDyn> {
    let fmt = format.unwrap_or(PixelFormat::Rgb);
    let alpha = match fmt {
        PixelFormat::Rgb => false,
        PixelFormat::Rgba => true,
        _ => {
            return Err(Error::NotImplemented(
                "Unsupported image format".to_string(),
            ));
        }
    };

    let options = DecoderOptions::default()
        .png_set_add_alpha_channel(alpha)
        .png_set_decode_animated(false);
    let mut decoder = PngDecoder::new_with_options(image, options);
    decoder.decode_headers()?;
    let image_info = decoder.get_info().ok_or(Error::Internal(
        "PNG did not return decoded image info".to_string(),
    ))?;

    let (rotation, flip) = image_info
        .exif
        .as_ref()
        .map(|x| read_exif_orientation(x))
        .unwrap_or((Rotation::None, Flip::None));

    if (rotation, flip) == (Rotation::None, Flip::None) {
        let img = Tensor::<u8>::image(image_info.width, image_info.height, fmt, memory)?;
        decoder.decode_into(&mut img.map()?)?;
        return Ok(TensorDyn::from(img));
    }

    let tmp = Tensor::<u8>::image(
        image_info.width,
        image_info.height,
        fmt,
        Some(TensorMemory::Mem),
    )?;
    decoder.decode_into(&mut tmp.map()?)?;

    rotate_flip_to_dyn(&tmp, fmt, rotation, flip, memory)
}

/// Load an image from raw bytes (JPEG or PNG) and return a [`TensorDyn`].
///
/// The optional `format` specifies the desired output pixel format (e.g.,
/// [`PixelFormat::Rgb`], [`PixelFormat::Rgba`]); if `None`, the native
/// format of the file is used (typically RGB for JPEG).
///
/// # Examples
/// ```rust
/// use edgefirst_image::load_image;
/// use edgefirst_tensor::PixelFormat;
/// # fn main() -> Result<(), edgefirst_image::Error> {
/// let jpeg = include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/../../testdata/zidane.jpg"));
/// let img = load_image(jpeg, Some(PixelFormat::Rgb), None)?;
/// assert_eq!(img.width(), Some(1280));
/// assert_eq!(img.height(), Some(720));
/// # Ok(())
/// # }
/// ```
pub fn load_image(
    image: &[u8],
    format: Option<PixelFormat>,
    memory: Option<TensorMemory>,
) -> Result<TensorDyn> {
    if let Ok(i) = load_jpeg(image, format, memory) {
        return Ok(i);
    }
    if let Ok(i) = load_png(image, format, memory) {
        return Ok(i);
    }
    Err(Error::NotSupported(
        "Could not decode as jpeg or png".to_string(),
    ))
}

/// Save a [`TensorDyn`] image as a JPEG file.
///
/// Only packed RGB and RGBA formats are supported.
pub fn save_jpeg(tensor: &TensorDyn, path: impl AsRef<std::path::Path>, quality: u8) -> Result<()> {
    let t = tensor.as_u8().ok_or(Error::UnsupportedFormat(
        "save_jpeg requires u8 tensor".to_string(),
    ))?;
    let fmt = t.format().ok_or(Error::NotAnImage)?;
    if fmt.layout() != PixelLayout::Packed {
        return Err(Error::NotImplemented(
            "Saving planar images is not supported".to_string(),
        ));
    }

    let colour = match fmt {
        PixelFormat::Rgb => jpeg_encoder::ColorType::Rgb,
        PixelFormat::Rgba => jpeg_encoder::ColorType::Rgba,
        _ => {
            return Err(Error::NotImplemented(
                "Unsupported image format for saving".to_string(),
            ));
        }
    };

    let w = t.width().ok_or(Error::NotAnImage)?;
    let h = t.height().ok_or(Error::NotAnImage)?;
    let encoder = jpeg_encoder::Encoder::new_file(path, quality)?;
    let tensor_map = t.map()?;

    encoder.encode(&tensor_map, w as u16, h as u16, colour)?;

    Ok(())
}

pub(crate) struct FunctionTimer<T: Display> {
    name: T,
    start: std::time::Instant,
}

impl<T: Display> FunctionTimer<T> {
    pub fn new(name: T) -> Self {
        Self {
            name,
            start: std::time::Instant::now(),
        }
    }
}

impl<T: Display> Drop for FunctionTimer<T> {
    fn drop(&mut self) {
        log::trace!("{} elapsed: {:?}", self.name, self.start.elapsed())
    }
}

const DEFAULT_COLORS: [[f32; 4]; 20] = [
    [0., 1., 0., 0.7],
    [1., 0.5568628, 0., 0.7],
    [0.25882353, 0.15294118, 0.13333333, 0.7],
    [0.8, 0.7647059, 0.78039216, 0.7],
    [0.3137255, 0.3137255, 0.3137255, 0.7],
    [0.1411765, 0.3098039, 0.1215686, 0.7],
    [1., 0.95686275, 0.5137255, 0.7],
    [0.3529412, 0.32156863, 0., 0.7],
    [0.4235294, 0.6235294, 0.6509804, 0.7],
    [0.5098039, 0.5098039, 0.7294118, 0.7],
    [0.00784314, 0.18823529, 0.29411765, 0.7],
    [0.0, 0.2706, 1.0, 0.7],
    [0.0, 0.0, 0.0, 0.7],
    [0.0, 0.5, 0.0, 0.7],
    [1.0, 0.0, 0.0, 0.7],
    [0.0, 0.0, 1.0, 0.7],
    [1.0, 0.5, 0.5, 0.7],
    [0.1333, 0.5451, 0.1333, 0.7],
    [0.1176, 0.4118, 0.8235, 0.7],
    [1., 1., 1., 0.7],
];

const fn denorm<const M: usize, const N: usize>(a: [[f32; M]; N]) -> [[u8; M]; N] {
    let mut result = [[0; M]; N];
    let mut i = 0;
    while i < N {
        let mut j = 0;
        while j < M {
            result[i][j] = (a[i][j] * 255.0).round() as u8;
            j += 1;
        }
        i += 1;
    }
    result
}

const DEFAULT_COLORS_U8: [[u8; 4]; 20] = denorm(DEFAULT_COLORS);

#[cfg(test)]
#[cfg_attr(coverage_nightly, coverage(off))]
mod image_tests {
    use super::*;
    use crate::{CPUProcessor, Rotation};
    #[cfg(target_os = "linux")]
    use edgefirst_tensor::is_dma_available;
    use edgefirst_tensor::{TensorMapTrait, TensorMemory, TensorTrait};
    use image::buffer::ConvertBuffer;

    /// Test helper: call `ImageProcessorTrait::convert()` on two `TensorDyn`s
    /// by going through the `TensorDyn` API.
    ///
    /// Returns the `(src_image, dst_image)` reconstructed from the TensorDyn
    /// round-trip so the caller can feed them to `compare_images` etc.
    fn convert_img(
        proc: &mut dyn ImageProcessorTrait,
        src: TensorDyn,
        dst: TensorDyn,
        rotation: Rotation,
        flip: Flip,
        crop: Crop,
    ) -> (Result<()>, TensorDyn, TensorDyn) {
        let src_fourcc = src.format().unwrap();
        let dst_fourcc = dst.format().unwrap();
        let src_dyn = src;
        let mut dst_dyn = dst;
        let result = proc.convert(&src_dyn, &mut dst_dyn, rotation, flip, crop);
        let src_back = {
            let mut __t = src_dyn.into_u8().unwrap();
            __t.set_format(src_fourcc).unwrap();
            TensorDyn::from(__t)
        };
        let dst_back = {
            let mut __t = dst_dyn.into_u8().unwrap();
            __t.set_format(dst_fourcc).unwrap();
            TensorDyn::from(__t)
        };
        (result, src_back, dst_back)
    }

    #[ctor::ctor]
    fn init() {
        env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("info")).init();
    }

    macro_rules! function {
        () => {{
            fn f() {}
            fn type_name_of<T>(_: T) -> &'static str {
                std::any::type_name::<T>()
            }
            let name = type_name_of(f);

            // Find and cut the rest of the path
            match &name[..name.len() - 3].rfind(':') {
                Some(pos) => &name[pos + 1..name.len() - 3],
                None => &name[..name.len() - 3],
            }
        }};
    }

    #[test]
    fn test_invalid_crop() {
        let src = TensorDyn::image(100, 100, PixelFormat::Rgb, DType::U8, None).unwrap();
        let dst = TensorDyn::image(100, 100, PixelFormat::Rgb, DType::U8, None).unwrap();

        let crop = Crop::new()
            .with_src_rect(Some(Rect::new(50, 50, 60, 60)))
            .with_dst_rect(Some(Rect::new(0, 0, 150, 150)));

        let result = crop.check_crop_dyn(&src, &dst);
        assert!(matches!(
            result,
            Err(Error::CropInvalid(e)) if e.starts_with("Dest and Src crop invalid")
        ));

        let crop = crop.with_src_rect(Some(Rect::new(0, 0, 10, 10)));
        let result = crop.check_crop_dyn(&src, &dst);
        assert!(matches!(
            result,
            Err(Error::CropInvalid(e)) if e.starts_with("Dest crop invalid")
        ));

        let crop = crop
            .with_src_rect(Some(Rect::new(50, 50, 60, 60)))
            .with_dst_rect(Some(Rect::new(0, 0, 50, 50)));
        let result = crop.check_crop_dyn(&src, &dst);
        assert!(matches!(
            result,
            Err(Error::CropInvalid(e)) if e.starts_with("Src crop invalid")
        ));

        let crop = crop.with_src_rect(Some(Rect::new(50, 50, 50, 50)));

        let result = crop.check_crop_dyn(&src, &dst);
        assert!(result.is_ok());
    }

    #[test]
    fn test_invalid_tensor_format() -> Result<(), Error> {
        // 4D tensor cannot be set to a 3-channel pixel format
        let mut tensor = Tensor::<u8>::new(&[720, 1280, 4, 1], None, None)?;
        let result = tensor.set_format(PixelFormat::Rgb);
        assert!(result.is_err(), "4D tensor should reject set_format");

        // Tensor with wrong channel count for the format
        let mut tensor = Tensor::<u8>::new(&[720, 1280, 4], None, None)?;
        let result = tensor.set_format(PixelFormat::Rgb);
        assert!(result.is_err(), "4-channel tensor should reject RGB format");

        Ok(())
    }

    #[test]
    fn test_invalid_image_file() -> Result<(), Error> {
        let result = crate::load_image(&[123; 5000], None, None);
        assert!(matches!(
            result,
            Err(Error::NotSupported(e)) if e == "Could not decode as jpeg or png"));

        Ok(())
    }

    #[test]
    fn test_invalid_jpeg_format() -> Result<(), Error> {
        let result = crate::load_image(&[123; 5000], Some(PixelFormat::Yuyv), None);
        assert!(matches!(
            result,
            Err(Error::NotSupported(e)) if e == "Could not decode as jpeg or png"));

        Ok(())
    }

    #[test]
    fn test_load_resize_save() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ));
        let img = crate::load_image(file, Some(PixelFormat::Rgba), None).unwrap();
        assert_eq!(img.width(), Some(1280));
        assert_eq!(img.height(), Some(720));

        let dst = TensorDyn::image(640, 360, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut converter = CPUProcessor::new();
        let (result, _img, dst) = convert_img(
            &mut converter,
            img,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();
        assert_eq!(dst.width(), Some(640));
        assert_eq!(dst.height(), Some(360));

        crate::save_jpeg(&dst, "zidane_resized.jpg", 80).unwrap();

        let file = std::fs::read("zidane_resized.jpg").unwrap();
        let img = crate::load_image(&file, None, None).unwrap();
        assert_eq!(img.width(), Some(640));
        assert_eq!(img.height(), Some(360));
        assert_eq!(img.format().unwrap(), PixelFormat::Rgb);
    }

    #[test]
    fn test_from_tensor_planar() -> Result<(), Error> {
        let mut tensor = Tensor::new(&[3, 720, 1280], None, None)?;
        tensor.map()?.copy_from_slice(include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/camera720p.8bps"
        )));
        let planar = {
            tensor
                .set_format(PixelFormat::PlanarRgb)
                .map_err(|e| crate::Error::Internal(e.to_string()))?;
            TensorDyn::from(tensor)
        };

        let rbga = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Rgba,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )),
        )?;
        compare_images_convert_to_rgb(&planar, &rbga, 0.98, function!());

        Ok(())
    }

    #[test]
    fn test_from_tensor_invalid_format() {
        // PixelFormat::from_fourcc_str returns None for unknown FourCC codes.
        // Since there's no "TEST" pixel format, this validates graceful handling.
        assert!(PixelFormat::from_fourcc(u32::from_le_bytes(*b"TEST")).is_none());
    }

    #[test]
    #[should_panic(expected = "Failed to save planar RGB image")]
    fn test_save_planar() {
        let planar_img = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::PlanarRgb,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.8bps"
            )),
        )
        .unwrap();

        let save_path = "/tmp/planar_rgb.jpg";
        crate::save_jpeg(&planar_img, save_path, 90).expect("Failed to save planar RGB image");
    }

    #[test]
    #[should_panic(expected = "Failed to save YUYV image")]
    fn test_save_yuyv() {
        let planar_img = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Yuyv,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.yuyv"
            )),
        )
        .unwrap();

        let save_path = "/tmp/yuyv.jpg";
        crate::save_jpeg(&planar_img, save_path, 90).expect("Failed to save YUYV image");
    }

    #[test]
    fn test_rotation_angle() {
        assert_eq!(Rotation::from_degrees_clockwise(0), Rotation::None);
        assert_eq!(Rotation::from_degrees_clockwise(90), Rotation::Clockwise90);
        assert_eq!(Rotation::from_degrees_clockwise(180), Rotation::Rotate180);
        assert_eq!(
            Rotation::from_degrees_clockwise(270),
            Rotation::CounterClockwise90
        );
        assert_eq!(Rotation::from_degrees_clockwise(360), Rotation::None);
        assert_eq!(Rotation::from_degrees_clockwise(450), Rotation::Clockwise90);
        assert_eq!(Rotation::from_degrees_clockwise(540), Rotation::Rotate180);
        assert_eq!(
            Rotation::from_degrees_clockwise(630),
            Rotation::CounterClockwise90
        );
    }

    #[test]
    #[should_panic(expected = "rotation angle is not a multiple of 90")]
    fn test_rotation_angle_panic() {
        Rotation::from_degrees_clockwise(361);
    }

    #[test]
    fn test_disable_env_var() -> Result<(), Error> {
        #[cfg(target_os = "linux")]
        {
            let original = std::env::var("EDGEFIRST_DISABLE_G2D").ok();
            unsafe { std::env::set_var("EDGEFIRST_DISABLE_G2D", "1") };
            let converter = ImageProcessor::new()?;
            match original {
                Some(s) => unsafe { std::env::set_var("EDGEFIRST_DISABLE_G2D", s) },
                None => unsafe { std::env::remove_var("EDGEFIRST_DISABLE_G2D") },
            }
            assert!(converter.g2d.is_none());
        }

        #[cfg(target_os = "linux")]
        #[cfg(feature = "opengl")]
        {
            let original = std::env::var("EDGEFIRST_DISABLE_GL").ok();
            unsafe { std::env::set_var("EDGEFIRST_DISABLE_GL", "1") };
            let converter = ImageProcessor::new()?;
            match original {
                Some(s) => unsafe { std::env::set_var("EDGEFIRST_DISABLE_GL", s) },
                None => unsafe { std::env::remove_var("EDGEFIRST_DISABLE_GL") },
            }
            assert!(converter.opengl.is_none());
        }

        let original = std::env::var("EDGEFIRST_DISABLE_CPU").ok();
        unsafe { std::env::set_var("EDGEFIRST_DISABLE_CPU", "1") };
        let converter = ImageProcessor::new()?;
        match original {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_DISABLE_CPU", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_DISABLE_CPU") },
        }
        assert!(converter.cpu.is_none());

        let original_cpu = std::env::var("EDGEFIRST_DISABLE_CPU").ok();
        unsafe { std::env::set_var("EDGEFIRST_DISABLE_CPU", "1") };
        let original_gl = std::env::var("EDGEFIRST_DISABLE_GL").ok();
        unsafe { std::env::set_var("EDGEFIRST_DISABLE_GL", "1") };
        let original_g2d = std::env::var("EDGEFIRST_DISABLE_G2D").ok();
        unsafe { std::env::set_var("EDGEFIRST_DISABLE_G2D", "1") };
        let mut converter = ImageProcessor::new()?;

        let src = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None)?;
        let dst = TensorDyn::image(640, 360, PixelFormat::Rgba, DType::U8, None)?;
        let (result, _src, _dst) = convert_img(
            &mut converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        assert!(matches!(result, Err(Error::NoConverter)));

        match original_cpu {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_DISABLE_CPU", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_DISABLE_CPU") },
        }
        match original_gl {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_DISABLE_GL", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_DISABLE_GL") },
        }
        match original_g2d {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_DISABLE_G2D", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_DISABLE_G2D") },
        }

        Ok(())
    }

    #[test]
    fn test_unsupported_conversion() {
        let src = TensorDyn::image(1280, 720, PixelFormat::Nv12, DType::U8, None).unwrap();
        let dst = TensorDyn::image(640, 360, PixelFormat::Nv12, DType::U8, None).unwrap();
        let mut converter = ImageProcessor::new().unwrap();
        let (result, _src, _dst) = convert_img(
            &mut converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        log::debug!("result: {:?}", result);
        assert!(matches!(
            result,
            Err(Error::NotSupported(e)) if e.starts_with("Conversion from NV12 to NV12")
        ));
    }

    #[test]
    fn test_load_grey() {
        let grey_img = crate::load_image(
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/grey.jpg"
            )),
            Some(PixelFormat::Rgba),
            None,
        )
        .unwrap();

        let grey_but_rgb_img = crate::load_image(
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/grey-rgb.jpg"
            )),
            Some(PixelFormat::Rgba),
            None,
        )
        .unwrap();

        compare_images(&grey_img, &grey_but_rgb_img, 0.99, function!());
    }

    #[test]
    fn test_new_nv12() {
        let nv12 = TensorDyn::image(1280, 720, PixelFormat::Nv12, DType::U8, None).unwrap();
        assert_eq!(nv12.height(), Some(720));
        assert_eq!(nv12.width(), Some(1280));
        assert_eq!(nv12.format().unwrap(), PixelFormat::Nv12);
        // PixelFormat::Nv12.channels() returns 1 (luma plane channel count)
        assert_eq!(nv12.format().unwrap().channels(), 1);
        assert!(nv12.format().is_some_and(
            |f| f.layout() == PixelLayout::Planar || f.layout() == PixelLayout::SemiPlanar
        ))
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_new_image_converter() {
        let dst_width = 640;
        let dst_height = 360;
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let mut converter = ImageProcessor::new().unwrap();
        let converter_dst = converter
            .create_image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None)
            .unwrap();
        let (result, src, converter_dst) = convert_img(
            &mut converter,
            src,
            converter_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let (result, _src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&converter_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_create_image_dtype_i8() {
        let mut converter = ImageProcessor::new().unwrap();

        // I8 image should allocate successfully via create_image
        let dst = converter
            .create_image(320, 240, PixelFormat::Rgb, DType::I8, None)
            .unwrap();
        assert_eq!(dst.dtype(), DType::I8);
        assert!(dst.width() == Some(320));
        assert!(dst.height() == Some(240));
        assert_eq!(dst.format(), Some(PixelFormat::Rgb));

        // U8 for comparison
        let dst_u8 = converter
            .create_image(320, 240, PixelFormat::Rgb, DType::U8, None)
            .unwrap();
        assert_eq!(dst_u8.dtype(), DType::U8);

        // Convert into I8 dst should succeed
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();
        let mut dst_i8 = converter
            .create_image(320, 240, PixelFormat::Rgb, DType::I8, None)
            .unwrap();
        converter
            .convert(
                &src,
                &mut dst_i8,
                Rotation::None,
                Flip::None,
                Crop::no_crop(),
            )
            .unwrap();
    }

    #[test]
    #[ignore] // Hangs on desktop platforms where DMA-buf is unavailable and PBO
              // fallback triggers a GPU driver hang during SHM→texture upload (e.g.,
              // NVIDIA without /dev/dma_heap permissions). Works on embedded targets.
    fn test_crop_skip() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let mut converter = ImageProcessor::new().unwrap();
        let converter_dst = converter
            .create_image(1280, 720, PixelFormat::Rgba, DType::U8, None)
            .unwrap();
        let crop = Crop::new()
            .with_src_rect(Some(Rect::new(0, 0, 640, 640)))
            .with_dst_rect(Some(Rect::new(0, 0, 640, 640)));
        let (result, src, converter_dst) = convert_img(
            &mut converter,
            src,
            converter_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        let cpu_dst = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let (result, _src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        compare_images(&converter_dst, &cpu_dst, 0.99999, function!());
    }

    #[test]
    fn test_invalid_pixel_format() {
        // PixelFormat::from_fourcc returns None for unknown formats,
        // so TensorDyn::image cannot be called with an invalid format.
        assert!(PixelFormat::from_fourcc(u32::from_le_bytes(*b"TEST")).is_none());
    }

    // Helper function to check if G2D library is available (Linux/i.MX8 only)
    #[cfg(target_os = "linux")]
    static G2D_AVAILABLE: std::sync::OnceLock<bool> = std::sync::OnceLock::new();

    #[cfg(target_os = "linux")]
    fn is_g2d_available() -> bool {
        *G2D_AVAILABLE.get_or_init(|| G2DProcessor::new().is_ok())
    }

    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    static GL_AVAILABLE: std::sync::OnceLock<bool> = std::sync::OnceLock::new();

    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    // Helper function to check if OpenGL is available
    fn is_opengl_available() -> bool {
        #[cfg(all(target_os = "linux", feature = "opengl"))]
        {
            *GL_AVAILABLE.get_or_init(|| GLProcessorThreaded::new(None).is_ok())
        }

        #[cfg(not(all(target_os = "linux", feature = "opengl")))]
        {
            false
        }
    }

    #[test]
    fn test_load_jpeg_with_exif() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane_rotated_exif.jpg"
        ))
        .to_vec();
        let loaded = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        assert_eq!(loaded.height(), Some(1280));
        assert_eq!(loaded.width(), Some(720));

        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let cpu_src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let (dst_width, dst_height) = (cpu_src.height().unwrap(), cpu_src.width().unwrap());

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _cpu_src, cpu_dst) = convert_img(
            &mut cpu_converter,
            cpu_src,
            cpu_dst,
            Rotation::Clockwise90,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&loaded, &cpu_dst, 0.98, function!());
    }

    #[test]
    fn test_load_png_with_exif() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane_rotated_exif_180.png"
        ))
        .to_vec();
        let loaded = crate::load_png(&file, Some(PixelFormat::Rgba), None).unwrap();

        assert_eq!(loaded.height(), Some(720));
        assert_eq!(loaded.width(), Some(1280));

        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let cpu_src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let cpu_dst = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _cpu_src, cpu_dst) = convert_img(
            &mut cpu_converter,
            cpu_src,
            cpu_dst,
            Rotation::Rotate180,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&loaded, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_g2d_resize() {
        if !is_g2d_available() {
            eprintln!("SKIPPED: test_g2d_resize - G2D library (libg2d.so.2) not available");
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_g2d_resize - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let dst_width = 640;
        let dst_height = 360;
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src =
            crate::load_image(&file, Some(PixelFormat::Rgba), Some(TensorMemory::Dma)).unwrap();

        let g2d_dst = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();
        let (result, src, g2d_dst) = convert_img(
            &mut g2d_converter,
            src,
            g2d_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let (result, _src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&g2d_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_opengl_resize() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }

        let dst_width = 640;
        let dst_height = 360;
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let (result, src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let mut src = src;
        let mut gl_converter = GLProcessorThreaded::new(None).unwrap();

        for _ in 0..5 {
            let gl_dst =
                TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None)
                    .unwrap();
            let (result, src_back, gl_dst) = convert_img(
                &mut gl_converter,
                src,
                gl_dst,
                Rotation::None,
                Flip::None,
                Crop::no_crop(),
            );
            result.unwrap();
            src = src_back;

            compare_images(&gl_dst, &cpu_dst, 0.98, function!());
        }
    }

    #[test]
    #[ignore] // Vivante GPU hangs with concurrent EGL contexts on i.MX8MP
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_opengl_10_threads() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }

        let handles: Vec<_> = (0..10)
            .map(|i| {
                std::thread::Builder::new()
                    .name(format!("Thread {i}"))
                    .spawn(test_opengl_resize)
                    .unwrap()
            })
            .collect();
        handles.into_iter().for_each(|h| {
            if let Err(e) = h.join() {
                std::panic::resume_unwind(e)
            }
        });
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_opengl_grey() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }

        let img = crate::load_image(
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/grey.jpg"
            )),
            Some(PixelFormat::Grey),
            None,
        )
        .unwrap();

        let gl_dst = TensorDyn::image(640, 640, PixelFormat::Grey, DType::U8, None).unwrap();
        let cpu_dst = TensorDyn::image(640, 640, PixelFormat::Grey, DType::U8, None).unwrap();

        let mut converter = CPUProcessor::new();

        let (result, img, cpu_dst) = convert_img(
            &mut converter,
            img,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let mut gl = GLProcessorThreaded::new(None).unwrap();
        let (result, _img, gl_dst) = convert_img(
            &mut gl,
            img,
            gl_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&gl_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_g2d_src_crop() {
        if !is_g2d_available() {
            eprintln!("SKIPPED: test_g2d_src_crop - G2D library (libg2d.so.2) not available");
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_g2d_src_crop - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let dst_width = 640;
        let dst_height = 640;
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let crop = Crop {
            src_rect: Some(Rect {
                left: 0,
                top: 0,
                width: 640,
                height: 360,
            }),
            dst_rect: None,
            dst_color: None,
        };
        let (result, src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        let g2d_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();
        let (result, _src, g2d_dst) = convert_img(
            &mut g2d_converter,
            src,
            g2d_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        compare_images(&g2d_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_g2d_dst_crop() {
        if !is_g2d_available() {
            eprintln!("SKIPPED: test_g2d_dst_crop - G2D library (libg2d.so.2) not available");
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_g2d_dst_crop - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let dst_width = 640;
        let dst_height = 640;
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let crop = Crop {
            src_rect: None,
            dst_rect: Some(Rect::new(100, 100, 512, 288)),
            dst_color: None,
        };
        let (result, src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        let g2d_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();
        let (result, _src, g2d_dst) = convert_img(
            &mut g2d_converter,
            src,
            g2d_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        compare_images(&g2d_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_g2d_all_rgba() {
        if !is_g2d_available() {
            eprintln!("SKIPPED: test_g2d_all_rgba - G2D library (libg2d.so.2) not available");
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_g2d_all_rgba - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let dst_width = 640;
        let dst_height = 640;
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();
        let src_dyn = src;

        let mut cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let mut g2d_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();

        let crop = Crop {
            src_rect: Some(Rect::new(50, 120, 1024, 576)),
            dst_rect: Some(Rect::new(100, 100, 512, 288)),
            dst_color: None,
        };

        for rot in [
            Rotation::None,
            Rotation::Clockwise90,
            Rotation::Rotate180,
            Rotation::CounterClockwise90,
        ] {
            cpu_dst
                .as_u8()
                .unwrap()
                .map()
                .unwrap()
                .as_mut_slice()
                .fill(114);
            g2d_dst
                .as_u8()
                .unwrap()
                .map()
                .unwrap()
                .as_mut_slice()
                .fill(114);
            for flip in [Flip::None, Flip::Horizontal, Flip::Vertical] {
                let mut cpu_dst_dyn = cpu_dst;
                cpu_converter
                    .convert(&src_dyn, &mut cpu_dst_dyn, Rotation::None, Flip::None, crop)
                    .unwrap();
                cpu_dst = {
                    let mut __t = cpu_dst_dyn.into_u8().unwrap();
                    __t.set_format(PixelFormat::Rgba).unwrap();
                    TensorDyn::from(__t)
                };

                let mut g2d_dst_dyn = g2d_dst;
                g2d_converter
                    .convert(&src_dyn, &mut g2d_dst_dyn, Rotation::None, Flip::None, crop)
                    .unwrap();
                g2d_dst = {
                    let mut __t = g2d_dst_dyn.into_u8().unwrap();
                    __t.set_format(PixelFormat::Rgba).unwrap();
                    TensorDyn::from(__t)
                };

                compare_images(
                    &g2d_dst,
                    &cpu_dst,
                    0.98,
                    &format!("{} {:?} {:?}", function!(), rot, flip),
                );
            }
        }
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_opengl_src_crop() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }

        let dst_width = 640;
        let dst_height = 360;
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();
        let crop = Crop {
            src_rect: Some(Rect {
                left: 320,
                top: 180,
                width: 1280 - 320,
                height: 720 - 180,
            }),
            dst_rect: None,
            dst_color: None,
        };

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let (result, src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        let gl_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut gl_converter = GLProcessorThreaded::new(None).unwrap();
        let (result, _src, gl_dst) = convert_img(
            &mut gl_converter,
            src,
            gl_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        compare_images(&gl_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_opengl_dst_crop() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }

        let dst_width = 640;
        let dst_height = 640;
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let crop = Crop {
            src_rect: None,
            dst_rect: Some(Rect::new(100, 100, 512, 288)),
            dst_color: None,
        };
        let (result, src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        let gl_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut gl_converter = GLProcessorThreaded::new(None).unwrap();
        let (result, _src, gl_dst) = convert_img(
            &mut gl_converter,
            src,
            gl_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        compare_images(&gl_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_opengl_all_rgba() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }

        let dst_width = 640;
        let dst_height = 640;
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();

        let mut cpu_converter = CPUProcessor::new();

        let mut gl_converter = GLProcessorThreaded::new(None).unwrap();

        let mut mem = vec![None, Some(TensorMemory::Mem), Some(TensorMemory::Shm)];
        if is_dma_available() {
            mem.push(Some(TensorMemory::Dma));
        }
        let crop = Crop {
            src_rect: Some(Rect::new(50, 120, 1024, 576)),
            dst_rect: Some(Rect::new(100, 100, 512, 288)),
            dst_color: None,
        };
        for m in mem {
            let src = crate::load_image(&file, Some(PixelFormat::Rgba), m).unwrap();
            let src_dyn = src;

            for rot in [
                Rotation::None,
                Rotation::Clockwise90,
                Rotation::Rotate180,
                Rotation::CounterClockwise90,
            ] {
                for flip in [Flip::None, Flip::Horizontal, Flip::Vertical] {
                    let cpu_dst =
                        TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, m)
                            .unwrap();
                    let gl_dst =
                        TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, m)
                            .unwrap();
                    cpu_dst
                        .as_u8()
                        .unwrap()
                        .map()
                        .unwrap()
                        .as_mut_slice()
                        .fill(114);
                    gl_dst
                        .as_u8()
                        .unwrap()
                        .map()
                        .unwrap()
                        .as_mut_slice()
                        .fill(114);

                    let mut cpu_dst_dyn = cpu_dst;
                    cpu_converter
                        .convert(&src_dyn, &mut cpu_dst_dyn, Rotation::None, Flip::None, crop)
                        .unwrap();
                    let cpu_dst = {
                        let mut __t = cpu_dst_dyn.into_u8().unwrap();
                        __t.set_format(PixelFormat::Rgba).unwrap();
                        TensorDyn::from(__t)
                    };

                    let mut gl_dst_dyn = gl_dst;
                    gl_converter
                        .convert(&src_dyn, &mut gl_dst_dyn, Rotation::None, Flip::None, crop)
                        .map_err(|e| {
                            log::error!("error mem {m:?} rot {rot:?} error: {e:?}");
                            e
                        })
                        .unwrap();
                    let gl_dst = {
                        let mut __t = gl_dst_dyn.into_u8().unwrap();
                        __t.set_format(PixelFormat::Rgba).unwrap();
                        TensorDyn::from(__t)
                    };

                    compare_images(
                        &gl_dst,
                        &cpu_dst,
                        0.98,
                        &format!("{} {:?} {:?}", function!(), rot, flip),
                    );
                }
            }
        }
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_cpu_rotate() {
        for rot in [
            Rotation::Clockwise90,
            Rotation::Rotate180,
            Rotation::CounterClockwise90,
        ] {
            test_cpu_rotate_(rot);
        }
    }

    #[cfg(target_os = "linux")]
    fn test_cpu_rotate_(rot: Rotation) {
        // This test rotates the image 4 times and checks that the image was returned to
        // be the same Currently doesn't check if rotations actually rotated in
        // right direction
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();

        let unchanged_src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let (dst_width, dst_height) = match rot {
            Rotation::None | Rotation::Rotate180 => (src.width().unwrap(), src.height().unwrap()),
            Rotation::Clockwise90 | Rotation::CounterClockwise90 => {
                (src.height().unwrap(), src.width().unwrap())
            }
        };

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        // After rotating 4 times, the image should be the same as the original

        let (result, src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            rot,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let (result, cpu_dst, src) = convert_img(
            &mut cpu_converter,
            cpu_dst,
            src,
            rot,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let (result, src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            rot,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let (result, _cpu_dst, src) = convert_img(
            &mut cpu_converter,
            cpu_dst,
            src,
            rot,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&src, &unchanged_src, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_opengl_rotate() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }

        let size = (1280, 720);
        let mut mem = vec![None, Some(TensorMemory::Shm), Some(TensorMemory::Mem)];

        if is_dma_available() {
            mem.push(Some(TensorMemory::Dma));
        }
        for m in mem {
            for rot in [
                Rotation::Clockwise90,
                Rotation::Rotate180,
                Rotation::CounterClockwise90,
            ] {
                test_opengl_rotate_(size, rot, m);
            }
        }
    }

    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_opengl_rotate_(
        size: (usize, usize),
        rot: Rotation,
        tensor_memory: Option<TensorMemory>,
    ) {
        let (dst_width, dst_height) = match rot {
            Rotation::None | Rotation::Rotate180 => size,
            Rotation::Clockwise90 | Rotation::CounterClockwise90 => (size.1, size.0),
        };

        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), tensor_memory).unwrap();

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, mut src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            rot,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let mut gl_converter = GLProcessorThreaded::new(None).unwrap();

        for _ in 0..5 {
            let gl_dst = TensorDyn::image(
                dst_width,
                dst_height,
                PixelFormat::Rgba,
                DType::U8,
                tensor_memory,
            )
            .unwrap();
            let (result, src_back, gl_dst) = convert_img(
                &mut gl_converter,
                src,
                gl_dst,
                rot,
                Flip::None,
                Crop::no_crop(),
            );
            result.unwrap();
            src = src_back;
            compare_images(&gl_dst, &cpu_dst, 0.98, function!());
        }
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_g2d_rotate() {
        if !is_g2d_available() {
            eprintln!("SKIPPED: test_g2d_rotate - G2D library (libg2d.so.2) not available");
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_g2d_rotate - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let size = (1280, 720);
        for rot in [
            Rotation::Clockwise90,
            Rotation::Rotate180,
            Rotation::CounterClockwise90,
        ] {
            test_g2d_rotate_(size, rot);
        }
    }

    #[cfg(target_os = "linux")]
    fn test_g2d_rotate_(size: (usize, usize), rot: Rotation) {
        let (dst_width, dst_height) = match rot {
            Rotation::None | Rotation::Rotate180 => size,
            Rotation::Clockwise90 | Rotation::CounterClockwise90 => (size.1, size.0),
        };

        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src =
            crate::load_image(&file, Some(PixelFormat::Rgba), Some(TensorMemory::Dma)).unwrap();

        let cpu_dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            rot,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let g2d_dst = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();

        let (result, _src, g2d_dst) = convert_img(
            &mut g2d_converter,
            src,
            g2d_dst,
            rot,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&g2d_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    fn test_rgba_to_yuyv_resize_cpu() {
        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Rgba,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )),
        )
        .unwrap();

        let (dst_width, dst_height) = (640, 360);

        let dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Yuyv, DType::U8, None).unwrap();

        let dst_through_yuyv =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let dst_direct =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();

        let mut cpu_converter = CPUProcessor::new();

        let (result, src, dst) = convert_img(
            &mut cpu_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let (result, _dst, dst_through_yuyv) = convert_img(
            &mut cpu_converter,
            dst,
            dst_through_yuyv,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let (result, _src, dst_direct) = convert_img(
            &mut cpu_converter,
            src,
            dst_direct,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&dst_through_yuyv, &dst_direct, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    #[ignore = "opengl doesn't support rendering to PixelFormat::Yuyv texture"]
    fn test_rgba_to_yuyv_resize_opengl() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }

        if !is_dma_available() {
            eprintln!(
                "SKIPPED: {} - DMA memory allocation not available (permission denied or no DMA-BUF support)",
                function!()
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Rgba,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )),
        )
        .unwrap();

        let (dst_width, dst_height) = (640, 360);

        let dst = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::Yuyv,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();

        let mut gl_converter = GLProcessorThreaded::new(None).unwrap();

        let (result, src, dst) = convert_img(
            &mut gl_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::new()
                .with_dst_rect(Some(Rect::new(100, 100, 100, 100)))
                .with_dst_color(Some([255, 255, 255, 255])),
        );
        result.unwrap();

        std::fs::write(
            "rgba_to_yuyv_opengl.yuyv",
            dst.as_u8().unwrap().map().unwrap().as_slice(),
        )
        .unwrap();
        let cpu_dst = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::Yuyv,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let (result, _src, cpu_dst) = convert_img(
            &mut CPUProcessor::new(),
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images_convert_to_rgb(&dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_rgba_to_yuyv_resize_g2d() {
        if !is_g2d_available() {
            eprintln!(
                "SKIPPED: test_rgba_to_yuyv_resize_g2d - G2D library (libg2d.so.2) not available"
            );
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_rgba_to_yuyv_resize_g2d - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Rgba,
            Some(TensorMemory::Dma),
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )),
        )
        .unwrap();

        let (dst_width, dst_height) = (1280, 720);

        let cpu_dst = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::Yuyv,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();

        let g2d_dst = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::Yuyv,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();

        let mut g2d_converter = G2DProcessor::new().unwrap();
        let crop = Crop {
            src_rect: None,
            dst_rect: Some(Rect::new(100, 100, 2, 2)),
            dst_color: None,
        };

        g2d_dst
            .as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .fill(128);
        let (result, src, g2d_dst) = convert_img(
            &mut g2d_converter,
            src,
            g2d_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        let cpu_dst_img = cpu_dst;
        cpu_dst_img
            .as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .fill(128);
        let (result, _src, cpu_dst) = convert_img(
            &mut CPUProcessor::new(),
            src,
            cpu_dst_img,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        compare_images_convert_to_rgb(&cpu_dst, &g2d_dst, 0.98, function!());
    }

    #[test]
    fn test_yuyv_to_rgba_cpu() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/camera720p.yuyv"
        ))
        .to_vec();
        let src = TensorDyn::image(1280, 720, PixelFormat::Yuyv, DType::U8, None).unwrap();
        src.as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(&file);

        let dst = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst) = convert_img(
            &mut cpu_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let target_image = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        target_image
            .as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )));

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    fn test_yuyv_to_rgb_cpu() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/camera720p.yuyv"
        ))
        .to_vec();
        let src = TensorDyn::image(1280, 720, PixelFormat::Yuyv, DType::U8, None).unwrap();
        src.as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(&file);

        let dst = TensorDyn::image(1280, 720, PixelFormat::Rgb, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst) = convert_img(
            &mut cpu_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let target_image = TensorDyn::image(1280, 720, PixelFormat::Rgb, DType::U8, None).unwrap();
        target_image
            .as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .as_chunks_mut::<3>()
            .0
            .iter_mut()
            .zip(
                include_bytes!(concat!(
                    env!("CARGO_MANIFEST_DIR"),
                    "/../../testdata/camera720p.rgba"
                ))
                .as_chunks::<4>()
                .0,
            )
            .for_each(|(dst, src)| *dst = [src[0], src[1], src[2]]);

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_yuyv_to_rgba_g2d() {
        if !is_g2d_available() {
            eprintln!("SKIPPED: test_yuyv_to_rgba_g2d - G2D library (libg2d.so.2) not available");
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_yuyv_to_rgba_g2d - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Yuyv,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.yuyv"
            )),
        )
        .unwrap();

        let dst = TensorDyn::image(
            1280,
            720,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();

        let (result, _src, dst) = convert_img(
            &mut g2d_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let target_image = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        target_image
            .as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )));

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_yuyv_to_rgba_opengl() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: {} - DMA memory allocation not available (permission denied or no DMA-BUF support)",
                function!()
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Yuyv,
            Some(TensorMemory::Dma),
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.yuyv"
            )),
        )
        .unwrap();

        let dst = TensorDyn::image(
            1280,
            720,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut gl_converter = GLProcessorThreaded::new(None).unwrap();

        let (result, _src, dst) = convert_img(
            &mut gl_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let target_image = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        target_image
            .as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )));

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_yuyv_to_rgb_g2d() {
        if !is_g2d_available() {
            eprintln!("SKIPPED: test_yuyv_to_rgb_g2d - G2D library (libg2d.so.2) not available");
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_yuyv_to_rgb_g2d - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Yuyv,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.yuyv"
            )),
        )
        .unwrap();

        let g2d_dst = TensorDyn::image(
            1280,
            720,
            PixelFormat::Rgb,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();

        let (result, src, g2d_dst) = convert_img(
            &mut g2d_converter,
            src,
            g2d_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let cpu_dst = TensorDyn::image(1280, 720, PixelFormat::Rgb, DType::U8, None).unwrap();
        let mut cpu_converter: CPUProcessor = CPUProcessor::new();

        let (result, _src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&g2d_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_yuyv_to_yuyv_resize_g2d() {
        if !is_g2d_available() {
            eprintln!(
                "SKIPPED: test_yuyv_to_yuyv_resize_g2d - G2D library (libg2d.so.2) not available"
            );
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_yuyv_to_yuyv_resize_g2d - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Yuyv,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.yuyv"
            )),
        )
        .unwrap();

        let g2d_dst = TensorDyn::image(
            600,
            400,
            PixelFormat::Yuyv,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();

        let (result, src, g2d_dst) = convert_img(
            &mut g2d_converter,
            src,
            g2d_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let cpu_dst = TensorDyn::image(600, 400, PixelFormat::Yuyv, DType::U8, None).unwrap();
        let mut cpu_converter: CPUProcessor = CPUProcessor::new();

        let (result, _src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        // TODO: compare PixelFormat::Yuyv and PixelFormat::Yuyv images without having to convert them to PixelFormat::Rgb
        compare_images_convert_to_rgb(&g2d_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    fn test_yuyv_to_rgba_resize_cpu() {
        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Yuyv,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.yuyv"
            )),
        )
        .unwrap();

        let (dst_width, dst_height) = (960, 540);

        let dst =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst) = convert_img(
            &mut cpu_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let dst_target =
            TensorDyn::image(dst_width, dst_height, PixelFormat::Rgba, DType::U8, None).unwrap();
        let src_target = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Rgba,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )),
        )
        .unwrap();
        let (result, _src_target, dst_target) = convert_img(
            &mut cpu_converter,
            src_target,
            dst_target,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&dst, &dst_target, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    fn test_yuyv_to_rgba_crop_flip_g2d() {
        if !is_g2d_available() {
            eprintln!(
                "SKIPPED: test_yuyv_to_rgba_crop_flip_g2d - G2D library (libg2d.so.2) not available"
            );
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_yuyv_to_rgba_crop_flip_g2d - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Yuyv,
            Some(TensorMemory::Dma),
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.yuyv"
            )),
        )
        .unwrap();

        let (dst_width, dst_height) = (640, 640);

        let dst_g2d = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();
        let crop = Crop {
            src_rect: Some(Rect {
                left: 20,
                top: 15,
                width: 400,
                height: 300,
            }),
            dst_rect: None,
            dst_color: None,
        };

        let (result, src, dst_g2d) = convert_img(
            &mut g2d_converter,
            src,
            dst_g2d,
            Rotation::None,
            Flip::Horizontal,
            crop,
        );
        result.unwrap();

        let dst_cpu = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst_cpu) = convert_img(
            &mut cpu_converter,
            src,
            dst_cpu,
            Rotation::None,
            Flip::Horizontal,
            crop,
        );
        result.unwrap();
        compare_images(&dst_g2d, &dst_cpu, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_yuyv_to_rgba_crop_flip_opengl() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }

        if !is_dma_available() {
            eprintln!(
                "SKIPPED: {} - DMA memory allocation not available (permission denied or no DMA-BUF support)",
                function!()
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Yuyv,
            Some(TensorMemory::Dma),
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.yuyv"
            )),
        )
        .unwrap();

        let (dst_width, dst_height) = (640, 640);

        let dst_gl = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut gl_converter = GLProcessorThreaded::new(None).unwrap();
        let crop = Crop {
            src_rect: Some(Rect {
                left: 20,
                top: 15,
                width: 400,
                height: 300,
            }),
            dst_rect: None,
            dst_color: None,
        };

        let (result, src, dst_gl) = convert_img(
            &mut gl_converter,
            src,
            dst_gl,
            Rotation::None,
            Flip::Horizontal,
            crop,
        );
        result.unwrap();

        let dst_cpu = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst_cpu) = convert_img(
            &mut cpu_converter,
            src,
            dst_cpu,
            Rotation::None,
            Flip::Horizontal,
            crop,
        );
        result.unwrap();
        compare_images(&dst_gl, &dst_cpu, 0.98, function!());
    }

    #[test]
    fn test_vyuy_to_rgba_cpu() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/camera720p.vyuy"
        ))
        .to_vec();
        let src = TensorDyn::image(1280, 720, PixelFormat::Vyuy, DType::U8, None).unwrap();
        src.as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(&file);

        let dst = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst) = convert_img(
            &mut cpu_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let target_image = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        target_image
            .as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )));

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    fn test_vyuy_to_rgb_cpu() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/camera720p.vyuy"
        ))
        .to_vec();
        let src = TensorDyn::image(1280, 720, PixelFormat::Vyuy, DType::U8, None).unwrap();
        src.as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(&file);

        let dst = TensorDyn::image(1280, 720, PixelFormat::Rgb, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst) = convert_img(
            &mut cpu_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let target_image = TensorDyn::image(1280, 720, PixelFormat::Rgb, DType::U8, None).unwrap();
        target_image
            .as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .as_chunks_mut::<3>()
            .0
            .iter_mut()
            .zip(
                include_bytes!(concat!(
                    env!("CARGO_MANIFEST_DIR"),
                    "/../../testdata/camera720p.rgba"
                ))
                .as_chunks::<4>()
                .0,
            )
            .for_each(|(dst, src)| *dst = [src[0], src[1], src[2]]);

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[ignore = "G2D does not support VYUY; re-enable when hardware support is added"]
    fn test_vyuy_to_rgba_g2d() {
        if !is_g2d_available() {
            eprintln!("SKIPPED: test_vyuy_to_rgba_g2d - G2D library (libg2d.so.2) not available");
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_vyuy_to_rgba_g2d - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Vyuy,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.vyuy"
            )),
        )
        .unwrap();

        let dst = TensorDyn::image(
            1280,
            720,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();

        let (result, _src, dst) = convert_img(
            &mut g2d_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        match result {
            Err(Error::G2D(_)) => {
                eprintln!("SKIPPED: test_vyuy_to_rgba_g2d - G2D does not support PixelFormat::Vyuy format");
                return;
            }
            r => r.unwrap(),
        }

        let target_image = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        target_image
            .as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )));

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[ignore = "G2D does not support VYUY; re-enable when hardware support is added"]
    fn test_vyuy_to_rgb_g2d() {
        if !is_g2d_available() {
            eprintln!("SKIPPED: test_vyuy_to_rgb_g2d - G2D library (libg2d.so.2) not available");
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: test_vyuy_to_rgb_g2d - DMA memory allocation not available (permission denied or no DMA-BUF support)"
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Vyuy,
            None,
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.vyuy"
            )),
        )
        .unwrap();

        let g2d_dst = TensorDyn::image(
            1280,
            720,
            PixelFormat::Rgb,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut g2d_converter = G2DProcessor::new().unwrap();

        let (result, src, g2d_dst) = convert_img(
            &mut g2d_converter,
            src,
            g2d_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        match result {
            Err(Error::G2D(_)) => {
                eprintln!(
                    "SKIPPED: test_vyuy_to_rgb_g2d - G2D does not support PixelFormat::Vyuy format"
                );
                return;
            }
            r => r.unwrap(),
        }

        let cpu_dst = TensorDyn::image(1280, 720, PixelFormat::Rgb, DType::U8, None).unwrap();
        let mut cpu_converter: CPUProcessor = CPUProcessor::new();

        let (result, _src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        compare_images(&g2d_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_vyuy_to_rgba_opengl() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }
        if !is_dma_available() {
            eprintln!(
                "SKIPPED: {} - DMA memory allocation not available (permission denied or no DMA-BUF support)",
                function!()
            );
            return;
        }

        let src = load_bytes_to_tensor(
            1280,
            720,
            PixelFormat::Vyuy,
            Some(TensorMemory::Dma),
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.vyuy"
            )),
        )
        .unwrap();

        let dst = TensorDyn::image(
            1280,
            720,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Dma),
        )
        .unwrap();
        let mut gl_converter = GLProcessorThreaded::new(None).unwrap();

        let (result, _src, dst) = convert_img(
            &mut gl_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        match result {
            Err(Error::NotSupported(_)) => {
                eprintln!(
                    "SKIPPED: {} - OpenGL does not support PixelFormat::Vyuy DMA format",
                    function!()
                );
                return;
            }
            r => r.unwrap(),
        }

        let target_image = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        target_image
            .as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/camera720p.rgba"
            )));

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    fn test_nv12_to_rgba_cpu() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.nv12"
        ))
        .to_vec();
        let src = TensorDyn::image(1280, 720, PixelFormat::Nv12, DType::U8, None).unwrap();
        src.as_u8().unwrap().map().unwrap().as_mut_slice()[0..(1280 * 720 * 3 / 2)]
            .copy_from_slice(&file);

        let dst = TensorDyn::image(1280, 720, PixelFormat::Rgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst) = convert_img(
            &mut cpu_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let target_image = crate::load_image(
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/zidane.jpg"
            )),
            Some(PixelFormat::Rgba),
            None,
        )
        .unwrap();

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    fn test_nv12_to_rgb_cpu() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.nv12"
        ))
        .to_vec();
        let src = TensorDyn::image(1280, 720, PixelFormat::Nv12, DType::U8, None).unwrap();
        src.as_u8().unwrap().map().unwrap().as_mut_slice()[0..(1280 * 720 * 3 / 2)]
            .copy_from_slice(&file);

        let dst = TensorDyn::image(1280, 720, PixelFormat::Rgb, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst) = convert_img(
            &mut cpu_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let target_image = crate::load_image(
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/zidane.jpg"
            )),
            Some(PixelFormat::Rgb),
            None,
        )
        .unwrap();

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    fn test_nv12_to_grey_cpu() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.nv12"
        ))
        .to_vec();
        let src = TensorDyn::image(1280, 720, PixelFormat::Nv12, DType::U8, None).unwrap();
        src.as_u8().unwrap().map().unwrap().as_mut_slice()[0..(1280 * 720 * 3 / 2)]
            .copy_from_slice(&file);

        let dst = TensorDyn::image(1280, 720, PixelFormat::Grey, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst) = convert_img(
            &mut cpu_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let target_image = crate::load_image(
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/zidane.jpg"
            )),
            Some(PixelFormat::Grey),
            None,
        )
        .unwrap();

        compare_images(&dst, &target_image, 0.98, function!());
    }

    #[test]
    fn test_nv12_to_yuyv_cpu() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.nv12"
        ))
        .to_vec();
        let src = TensorDyn::image(1280, 720, PixelFormat::Nv12, DType::U8, None).unwrap();
        src.as_u8().unwrap().map().unwrap().as_mut_slice()[0..(1280 * 720 * 3 / 2)]
            .copy_from_slice(&file);

        let dst = TensorDyn::image(1280, 720, PixelFormat::Yuyv, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, dst) = convert_img(
            &mut cpu_converter,
            src,
            dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let target_image = crate::load_image(
            include_bytes!(concat!(
                env!("CARGO_MANIFEST_DIR"),
                "/../../testdata/zidane.jpg"
            )),
            Some(PixelFormat::Rgb),
            None,
        )
        .unwrap();

        compare_images_convert_to_rgb(&dst, &target_image, 0.98, function!());
    }

    #[test]
    fn test_cpu_resize_planar_rgb() {
        let src = TensorDyn::image(4, 4, PixelFormat::Rgba, DType::U8, None).unwrap();
        #[rustfmt::skip]
        let src_image = [
                    255, 0, 0, 255,     0, 255, 0, 255,     0, 0, 255, 255,     255, 255, 0, 255,
                    255, 0, 0, 0,       0, 0, 0, 255,       255,  0, 255, 0,    255, 0, 255, 255,
                    0, 0, 255, 0,       0, 255, 255, 255,   255, 255, 0, 0,     0, 0, 0, 255,
                    255, 0, 0, 0,       0, 0, 0, 255,       255,  0, 255, 0,    255, 0, 255, 255,
        ];
        src.as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(&src_image);

        let cpu_dst = TensorDyn::image(5, 5, PixelFormat::PlanarRgb, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::new()
                .with_dst_rect(Some(Rect {
                    left: 1,
                    top: 1,
                    width: 4,
                    height: 4,
                }))
                .with_dst_color(Some([114, 114, 114, 255])),
        );
        result.unwrap();

        #[rustfmt::skip]
        let expected_dst = [
            114, 114, 114, 114, 114,    114, 255, 0, 0, 255,    114, 255, 0, 255, 255,      114, 0, 0, 255, 0,        114, 255, 0, 255, 255,
            114, 114, 114, 114, 114,    114, 0, 255, 0, 255,    114, 0, 0, 0, 0,            114, 0, 255, 255, 0,      114, 0, 0, 0, 0,
            114, 114, 114, 114, 114,    114, 0, 0, 255, 0,      114, 0, 0, 255, 255,        114, 255, 255, 0, 0,      114, 0, 0, 255, 255,
        ];

        assert_eq!(
            cpu_dst.as_u8().unwrap().map().unwrap().as_slice(),
            &expected_dst
        );
    }

    #[test]
    fn test_cpu_resize_planar_rgba() {
        let src = TensorDyn::image(4, 4, PixelFormat::Rgba, DType::U8, None).unwrap();
        #[rustfmt::skip]
        let src_image = [
                    255, 0, 0, 255,     0, 255, 0, 255,     0, 0, 255, 255,     255, 255, 0, 255,
                    255, 0, 0, 0,       0, 0, 0, 255,       255,  0, 255, 0,    255, 0, 255, 255,
                    0, 0, 255, 0,       0, 255, 255, 255,   255, 255, 0, 0,     0, 0, 0, 255,
                    255, 0, 0, 0,       0, 0, 0, 255,       255,  0, 255, 0,    255, 0, 255, 255,
        ];
        src.as_u8()
            .unwrap()
            .map()
            .unwrap()
            .as_mut_slice()
            .copy_from_slice(&src_image);

        let cpu_dst = TensorDyn::image(5, 5, PixelFormat::PlanarRgba, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();

        let (result, _src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::new()
                .with_dst_rect(Some(Rect {
                    left: 1,
                    top: 1,
                    width: 4,
                    height: 4,
                }))
                .with_dst_color(Some([114, 114, 114, 255])),
        );
        result.unwrap();

        #[rustfmt::skip]
        let expected_dst = [
            114, 114, 114, 114, 114,    114, 255, 0, 0, 255,        114, 255, 0, 255, 255,      114, 0, 0, 255, 0,        114, 255, 0, 255, 255,
            114, 114, 114, 114, 114,    114, 0, 255, 0, 255,        114, 0, 0, 0, 0,            114, 0, 255, 255, 0,      114, 0, 0, 0, 0,
            114, 114, 114, 114, 114,    114, 0, 0, 255, 0,          114, 0, 0, 255, 255,        114, 255, 255, 0, 0,      114, 0, 0, 255, 255,
            255, 255, 255, 255, 255,    255, 255, 255, 255, 255,    255, 0, 255, 0, 255,        255, 0, 255, 0, 255,      255, 0, 255, 0, 255,
        ];

        assert_eq!(
            cpu_dst.as_u8().unwrap().map().unwrap().as_slice(),
            &expected_dst
        );
    }

    #[test]
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    fn test_opengl_resize_planar_rgb() {
        if !is_opengl_available() {
            eprintln!("SKIPPED: {} - OpenGL not available", function!());
            return;
        }

        if !is_dma_available() {
            eprintln!(
                "SKIPPED: {} - DMA memory allocation not available (permission denied or no DMA-BUF support)",
                function!()
            );
            return;
        }

        let dst_width = 640;
        let dst_height = 640;
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/test_image.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let cpu_dst = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::PlanarRgb,
            DType::U8,
            None,
        )
        .unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let (result, src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();
        let crop_letterbox = Crop::new()
            .with_dst_rect(Some(Rect {
                left: 102,
                top: 102,
                width: 440,
                height: 440,
            }))
            .with_dst_color(Some([114, 114, 114, 114]));
        let (result, src, cpu_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            crop_letterbox,
        );
        result.unwrap();

        let gl_dst = TensorDyn::image(
            dst_width,
            dst_height,
            PixelFormat::PlanarRgb,
            DType::U8,
            None,
        )
        .unwrap();
        let mut gl_converter = GLProcessorThreaded::new(None).unwrap();

        let (result, _src, gl_dst) = convert_img(
            &mut gl_converter,
            src,
            gl_dst,
            Rotation::None,
            Flip::None,
            crop_letterbox,
        );
        result.unwrap();
        compare_images(&gl_dst, &cpu_dst, 0.98, function!());
    }

    #[test]
    fn test_cpu_resize_nv16() {
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        let cpu_nv16_dst = TensorDyn::image(640, 640, PixelFormat::Nv16, DType::U8, None).unwrap();
        let cpu_rgb_dst = TensorDyn::image(640, 640, PixelFormat::Rgb, DType::U8, None).unwrap();
        let mut cpu_converter = CPUProcessor::new();
        let crop = Crop::new()
            .with_dst_rect(Some(Rect {
                left: 20,
                top: 140,
                width: 600,
                height: 360,
            }))
            .with_dst_color(Some([255, 128, 0, 255]));

        let (result, src, cpu_nv16_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_nv16_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();

        let (result, _src, cpu_rgb_dst) = convert_img(
            &mut cpu_converter,
            src,
            cpu_rgb_dst,
            Rotation::None,
            Flip::None,
            crop,
        );
        result.unwrap();
        compare_images_convert_to_rgb(&cpu_nv16_dst, &cpu_rgb_dst, 0.99, function!());
    }

    fn load_bytes_to_tensor(
        width: usize,
        height: usize,
        format: PixelFormat,
        memory: Option<TensorMemory>,
        bytes: &[u8],
    ) -> Result<TensorDyn, Error> {
        let src = TensorDyn::image(width, height, format, DType::U8, memory)?;
        src.as_u8()
            .unwrap()
            .map()?
            .as_mut_slice()
            .copy_from_slice(bytes);
        Ok(src)
    }

    fn compare_images(img1: &TensorDyn, img2: &TensorDyn, threshold: f64, name: &str) {
        assert_eq!(img1.height(), img2.height(), "Heights differ");
        assert_eq!(img1.width(), img2.width(), "Widths differ");
        assert_eq!(
            img1.format().unwrap(),
            img2.format().unwrap(),
            "PixelFormat differ"
        );
        assert!(
            matches!(
                img1.format().unwrap(),
                PixelFormat::Rgb | PixelFormat::Rgba | PixelFormat::Grey | PixelFormat::PlanarRgb
            ),
            "format must be Rgb or Rgba for comparison"
        );

        let image1 = match img1.format().unwrap() {
            PixelFormat::Rgb => image::RgbImage::from_vec(
                img1.width().unwrap() as u32,
                img1.height().unwrap() as u32,
                img1.as_u8().unwrap().map().unwrap().to_vec(),
            )
            .unwrap(),
            PixelFormat::Rgba => image::RgbaImage::from_vec(
                img1.width().unwrap() as u32,
                img1.height().unwrap() as u32,
                img1.as_u8().unwrap().map().unwrap().to_vec(),
            )
            .unwrap()
            .convert(),
            PixelFormat::Grey => image::GrayImage::from_vec(
                img1.width().unwrap() as u32,
                img1.height().unwrap() as u32,
                img1.as_u8().unwrap().map().unwrap().to_vec(),
            )
            .unwrap()
            .convert(),
            PixelFormat::PlanarRgb => image::GrayImage::from_vec(
                img1.width().unwrap() as u32,
                (img1.height().unwrap() * 3) as u32,
                img1.as_u8().unwrap().map().unwrap().to_vec(),
            )
            .unwrap()
            .convert(),
            _ => return,
        };

        let image2 = match img2.format().unwrap() {
            PixelFormat::Rgb => image::RgbImage::from_vec(
                img2.width().unwrap() as u32,
                img2.height().unwrap() as u32,
                img2.as_u8().unwrap().map().unwrap().to_vec(),
            )
            .unwrap(),
            PixelFormat::Rgba => image::RgbaImage::from_vec(
                img2.width().unwrap() as u32,
                img2.height().unwrap() as u32,
                img2.as_u8().unwrap().map().unwrap().to_vec(),
            )
            .unwrap()
            .convert(),
            PixelFormat::Grey => image::GrayImage::from_vec(
                img2.width().unwrap() as u32,
                img2.height().unwrap() as u32,
                img2.as_u8().unwrap().map().unwrap().to_vec(),
            )
            .unwrap()
            .convert(),
            PixelFormat::PlanarRgb => image::GrayImage::from_vec(
                img2.width().unwrap() as u32,
                (img2.height().unwrap() * 3) as u32,
                img2.as_u8().unwrap().map().unwrap().to_vec(),
            )
            .unwrap()
            .convert(),
            _ => return,
        };

        let similarity = image_compare::rgb_similarity_structure(
            &image_compare::Algorithm::RootMeanSquared,
            &image1,
            &image2,
        )
        .expect("Image Comparison failed");
        if similarity.score < threshold {
            // image1.save(format!("{name}_1.png"));
            // image2.save(format!("{name}_2.png"));
            similarity
                .image
                .to_color_map()
                .save(format!("{name}.png"))
                .unwrap();
            panic!(
                "{name}: converted image and target image have similarity score too low: {} < {}",
                similarity.score, threshold
            )
        }
    }

    fn compare_images_convert_to_rgb(
        img1: &TensorDyn,
        img2: &TensorDyn,
        threshold: f64,
        name: &str,
    ) {
        assert_eq!(img1.height(), img2.height(), "Heights differ");
        assert_eq!(img1.width(), img2.width(), "Widths differ");

        let mut img_rgb1 = TensorDyn::image(
            img1.width().unwrap(),
            img1.height().unwrap(),
            PixelFormat::Rgb,
            DType::U8,
            Some(TensorMemory::Mem),
        )
        .unwrap();
        let mut img_rgb2 = TensorDyn::image(
            img1.width().unwrap(),
            img1.height().unwrap(),
            PixelFormat::Rgb,
            DType::U8,
            Some(TensorMemory::Mem),
        )
        .unwrap();
        let mut __cv = CPUProcessor::default();
        let r1 = __cv.convert(
            img1,
            &mut img_rgb1,
            crate::Rotation::None,
            crate::Flip::None,
            crate::Crop::default(),
        );
        let r2 = __cv.convert(
            img2,
            &mut img_rgb2,
            crate::Rotation::None,
            crate::Flip::None,
            crate::Crop::default(),
        );
        if r1.is_err() || r2.is_err() {
            // Fallback: compare raw bytes as greyscale strip
            let w = img1.width().unwrap() as u32;
            let data1 = img1.as_u8().unwrap().map().unwrap().to_vec();
            let data2 = img2.as_u8().unwrap().map().unwrap().to_vec();
            let h1 = (data1.len() as u32) / w;
            let h2 = (data2.len() as u32) / w;
            let g1 = image::GrayImage::from_vec(w, h1, data1).unwrap();
            let g2 = image::GrayImage::from_vec(w, h2, data2).unwrap();
            let similarity = image_compare::gray_similarity_structure(
                &image_compare::Algorithm::RootMeanSquared,
                &g1,
                &g2,
            )
            .expect("Image Comparison failed");
            if similarity.score < threshold {
                panic!(
                    "{name}: converted image and target image have similarity score too low: {} < {}",
                    similarity.score, threshold
                )
            }
            return;
        }

        let image1 = image::RgbImage::from_vec(
            img_rgb1.width().unwrap() as u32,
            img_rgb1.height().unwrap() as u32,
            img_rgb1.as_u8().unwrap().map().unwrap().to_vec(),
        )
        .unwrap();

        let image2 = image::RgbImage::from_vec(
            img_rgb2.width().unwrap() as u32,
            img_rgb2.height().unwrap() as u32,
            img_rgb2.as_u8().unwrap().map().unwrap().to_vec(),
        )
        .unwrap();

        let similarity = image_compare::rgb_similarity_structure(
            &image_compare::Algorithm::RootMeanSquared,
            &image1,
            &image2,
        )
        .expect("Image Comparison failed");
        if similarity.score < threshold {
            // image1.save(format!("{name}_1.png"));
            // image2.save(format!("{name}_2.png"));
            similarity
                .image
                .to_color_map()
                .save(format!("{name}.png"))
                .unwrap();
            panic!(
                "{name}: converted image and target image have similarity score too low: {} < {}",
                similarity.score, threshold
            )
        }
    }

    // =========================================================================
    // PixelFormat::Nv12 Format Tests
    // =========================================================================

    #[test]
    fn test_nv12_image_creation() {
        let width = 640;
        let height = 480;
        let img = TensorDyn::image(width, height, PixelFormat::Nv12, DType::U8, None).unwrap();

        assert_eq!(img.width(), Some(width));
        assert_eq!(img.height(), Some(height));
        assert_eq!(img.format().unwrap(), PixelFormat::Nv12);
        // PixelFormat::Nv12 uses shape [H*3/2, W] to store Y plane + UV plane
        assert_eq!(img.as_u8().unwrap().shape(), &[height * 3 / 2, width]);
    }

    #[test]
    fn test_nv12_channels() {
        let img = TensorDyn::image(640, 480, PixelFormat::Nv12, DType::U8, None).unwrap();
        // PixelFormat::Nv12.channels() returns 1 (luma plane)
        assert_eq!(img.format().unwrap().channels(), 1);
    }

    // =========================================================================
    // Tensor Format Metadata Tests
    // =========================================================================

    #[test]
    fn test_tensor_set_format_planar() {
        let mut tensor = Tensor::<u8>::new(&[3, 480, 640], None, None).unwrap();
        tensor.set_format(PixelFormat::PlanarRgb).unwrap();
        assert_eq!(tensor.format(), Some(PixelFormat::PlanarRgb));
        assert_eq!(tensor.width(), Some(640));
        assert_eq!(tensor.height(), Some(480));
    }

    #[test]
    fn test_tensor_set_format_interleaved() {
        let mut tensor = Tensor::<u8>::new(&[480, 640, 4], None, None).unwrap();
        tensor.set_format(PixelFormat::Rgba).unwrap();
        assert_eq!(tensor.format(), Some(PixelFormat::Rgba));
        assert_eq!(tensor.width(), Some(640));
        assert_eq!(tensor.height(), Some(480));
    }

    #[test]
    fn test_tensordyn_image_rgb() {
        let img = TensorDyn::image(640, 480, PixelFormat::Rgb, DType::U8, None).unwrap();
        assert_eq!(img.width(), Some(640));
        assert_eq!(img.height(), Some(480));
        assert_eq!(img.format(), Some(PixelFormat::Rgb));
    }

    #[test]
    fn test_tensordyn_image_planar_rgb() {
        let img = TensorDyn::image(640, 480, PixelFormat::PlanarRgb, DType::U8, None).unwrap();
        assert_eq!(img.width(), Some(640));
        assert_eq!(img.height(), Some(480));
        assert_eq!(img.format(), Some(PixelFormat::PlanarRgb));
    }

    #[test]
    fn test_rgb_int8_format() {
        // Int8 variant: same PixelFormat::Rgb but with DType::I8
        let img = TensorDyn::image(
            1280,
            720,
            PixelFormat::Rgb,
            DType::I8,
            Some(TensorMemory::Mem),
        )
        .unwrap();
        assert_eq!(img.width(), Some(1280));
        assert_eq!(img.height(), Some(720));
        assert_eq!(img.format(), Some(PixelFormat::Rgb));
        assert_eq!(img.dtype(), DType::I8);
    }

    #[test]
    fn test_planar_rgb_int8_format() {
        let img = TensorDyn::image(
            1280,
            720,
            PixelFormat::PlanarRgb,
            DType::I8,
            Some(TensorMemory::Mem),
        )
        .unwrap();
        assert_eq!(img.width(), Some(1280));
        assert_eq!(img.height(), Some(720));
        assert_eq!(img.format(), Some(PixelFormat::PlanarRgb));
        assert_eq!(img.dtype(), DType::I8);
    }

    #[test]
    fn test_rgb_from_tensor() {
        let mut tensor = Tensor::<u8>::new(&[720, 1280, 3], None, None).unwrap();
        tensor.set_format(PixelFormat::Rgb).unwrap();
        let img = TensorDyn::from(tensor);
        assert_eq!(img.width(), Some(1280));
        assert_eq!(img.height(), Some(720));
        assert_eq!(img.format(), Some(PixelFormat::Rgb));
    }

    #[test]
    fn test_planar_rgb_from_tensor() {
        let mut tensor = Tensor::<u8>::new(&[3, 720, 1280], None, None).unwrap();
        tensor.set_format(PixelFormat::PlanarRgb).unwrap();
        let img = TensorDyn::from(tensor);
        assert_eq!(img.width(), Some(1280));
        assert_eq!(img.height(), Some(720));
        assert_eq!(img.format(), Some(PixelFormat::PlanarRgb));
    }

    #[test]
    fn test_dtype_determines_int8() {
        // DType::I8 indicates int8 data
        let u8_img = TensorDyn::image(64, 64, PixelFormat::Rgb, DType::U8, None).unwrap();
        let i8_img = TensorDyn::image(64, 64, PixelFormat::Rgb, DType::I8, None).unwrap();
        assert_eq!(u8_img.dtype(), DType::U8);
        assert_eq!(i8_img.dtype(), DType::I8);
    }

    #[test]
    fn test_pixel_layout_packed_vs_planar() {
        // Packed vs planar layout classification
        assert_eq!(PixelFormat::Rgb.layout(), PixelLayout::Packed);
        assert_eq!(PixelFormat::Rgba.layout(), PixelLayout::Packed);
        assert_eq!(PixelFormat::PlanarRgb.layout(), PixelLayout::Planar);
        assert_eq!(PixelFormat::Nv12.layout(), PixelLayout::SemiPlanar);
    }

    /// Integration test that exercises the PBO-to-PBO convert path.
    /// Uses ImageProcessor::create_image() to allocate PBO-backed tensors,
    /// then converts between them. Skipped when GL is unavailable or the
    /// backend is not PBO (e.g. DMA-buf systems).
    #[cfg(target_os = "linux")]
    #[cfg(feature = "opengl")]
    #[test]
    fn test_convert_pbo_to_pbo() {
        let mut converter = ImageProcessor::new().unwrap();

        // Skip if GL is not available or backend is not PBO
        let is_pbo = converter
            .opengl
            .as_ref()
            .is_some_and(|gl| gl.transfer_backend() == opengl_headless::TransferBackend::Pbo);
        if !is_pbo {
            eprintln!("Skipping test_convert_pbo_to_pbo: backend is not PBO");
            return;
        }

        let src_w = 640;
        let src_h = 480;
        let dst_w = 320;
        let dst_h = 240;

        // Create PBO-backed source image
        let pbo_src = converter
            .create_image(src_w, src_h, PixelFormat::Rgba, DType::U8, None)
            .unwrap();
        assert_eq!(
            pbo_src.as_u8().unwrap().memory(),
            TensorMemory::Pbo,
            "create_image should produce a PBO tensor"
        );

        // Fill source PBO with test pattern: load JPEG then convert Mem→PBO
        let file = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ))
        .to_vec();
        let jpeg_src = crate::load_image(&file, Some(PixelFormat::Rgba), None).unwrap();

        // Resize JPEG into a Mem temp of the right size, then copy into PBO
        let mem_src = TensorDyn::image(
            src_w,
            src_h,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Mem),
        )
        .unwrap();
        let (result, _jpeg_src, mem_src) = convert_img(
            &mut CPUProcessor::new(),
            jpeg_src,
            mem_src,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        // Copy pixel data into the PBO source by mapping it
        {
            let src_data = mem_src.as_u8().unwrap().map().unwrap();
            let mut pbo_map = pbo_src.as_u8().unwrap().map().unwrap();
            pbo_map.copy_from_slice(&src_data);
        }

        // Create PBO-backed destination image
        let pbo_dst = converter
            .create_image(dst_w, dst_h, PixelFormat::Rgba, DType::U8, None)
            .unwrap();
        assert_eq!(pbo_dst.as_u8().unwrap().memory(), TensorMemory::Pbo);

        // Convert PBO→PBO (this exercises convert_pbo_to_pbo)
        let mut pbo_dst = pbo_dst;
        let result = converter.convert(
            &pbo_src,
            &mut pbo_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        // Verify: compare with CPU-only conversion of the same input
        let cpu_dst = TensorDyn::image(
            dst_w,
            dst_h,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Mem),
        )
        .unwrap();
        let (result, _mem_src, cpu_dst) = convert_img(
            &mut CPUProcessor::new(),
            mem_src,
            cpu_dst,
            Rotation::None,
            Flip::None,
            Crop::no_crop(),
        );
        result.unwrap();

        let pbo_dst_img = {
            let mut __t = pbo_dst.into_u8().unwrap();
            __t.set_format(PixelFormat::Rgba).unwrap();
            TensorDyn::from(__t)
        };
        compare_images(&pbo_dst_img, &cpu_dst, 0.95, function!());
        log::info!("test_convert_pbo_to_pbo: PASS — PBO-to-PBO convert matches CPU reference");
    }

    #[test]
    fn test_image_bgra() {
        let img = TensorDyn::image(
            640,
            480,
            PixelFormat::Bgra,
            DType::U8,
            Some(edgefirst_tensor::TensorMemory::Mem),
        )
        .unwrap();
        assert_eq!(img.width(), Some(640));
        assert_eq!(img.height(), Some(480));
        assert_eq!(img.format().unwrap().channels(), 4);
        assert_eq!(img.format().unwrap(), PixelFormat::Bgra);
    }

    // ========================================================================
    // Tests for EDGEFIRST_FORCE_BACKEND env var
    // ========================================================================

    #[test]
    fn test_force_backend_cpu() {
        let original = std::env::var("EDGEFIRST_FORCE_BACKEND").ok();
        unsafe { std::env::set_var("EDGEFIRST_FORCE_BACKEND", "cpu") };
        let result = ImageProcessor::new();
        match original {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_FORCE_BACKEND", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_FORCE_BACKEND") },
        }
        let converter = result.unwrap();
        assert!(converter.cpu.is_some());
        assert_eq!(converter.forced_backend, Some(ForcedBackend::Cpu));
    }

    #[test]
    fn test_force_backend_invalid() {
        let original = std::env::var("EDGEFIRST_FORCE_BACKEND").ok();
        unsafe { std::env::set_var("EDGEFIRST_FORCE_BACKEND", "invalid") };
        let result = ImageProcessor::new();
        match original {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_FORCE_BACKEND", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_FORCE_BACKEND") },
        }
        assert!(
            matches!(&result, Err(Error::ForcedBackendUnavailable(s)) if s.contains("unknown")),
            "invalid backend value should return ForcedBackendUnavailable error: {result:?}"
        );
    }

    #[test]
    fn test_force_backend_unset() {
        let original = std::env::var("EDGEFIRST_FORCE_BACKEND").ok();
        unsafe { std::env::remove_var("EDGEFIRST_FORCE_BACKEND") };
        let result = ImageProcessor::new();
        match original {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_FORCE_BACKEND", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_FORCE_BACKEND") },
        }
        let converter = result.unwrap();
        assert!(converter.forced_backend.is_none());
    }

    // ========================================================================
    // Tests for hybrid mask path error handling
    // ========================================================================

    #[test]
    fn test_draw_masks_proto_no_cpu_returns_error() {
        // Disable CPU backend to trigger the error path
        let original_cpu = std::env::var("EDGEFIRST_DISABLE_CPU").ok();
        unsafe { std::env::set_var("EDGEFIRST_DISABLE_CPU", "1") };
        let original_gl = std::env::var("EDGEFIRST_DISABLE_GL").ok();
        unsafe { std::env::set_var("EDGEFIRST_DISABLE_GL", "1") };
        let original_g2d = std::env::var("EDGEFIRST_DISABLE_G2D").ok();
        unsafe { std::env::set_var("EDGEFIRST_DISABLE_G2D", "1") };

        let result = ImageProcessor::new();

        match original_cpu {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_DISABLE_CPU", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_DISABLE_CPU") },
        }
        match original_gl {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_DISABLE_GL", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_DISABLE_GL") },
        }
        match original_g2d {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_DISABLE_G2D", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_DISABLE_G2D") },
        }

        let mut converter = result.unwrap();
        assert!(converter.cpu.is_none(), "CPU should be disabled");

        let dst = TensorDyn::image(
            640,
            480,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Mem),
        )
        .unwrap();
        let mut dst_dyn = dst;
        let det = [DetectBox {
            bbox: edgefirst_decoder::BoundingBox {
                xmin: 0.1,
                ymin: 0.1,
                xmax: 0.5,
                ymax: 0.5,
            },
            score: 0.9,
            label: 0,
        }];
        let proto_data = ProtoData {
            mask_coefficients: vec![vec![0.5; 4]],
            protos: edgefirst_decoder::ProtoTensor::Float(ndarray::Array3::<f32>::zeros((8, 8, 4))),
        };
        let result = converter.draw_masks_proto(&mut dst_dyn, &det, &proto_data);
        assert!(
            matches!(&result, Err(Error::Internal(s)) if s.contains("CPU backend")),
            "draw_masks_proto without CPU should return Internal error: {result:?}"
        );
    }

    #[test]
    fn test_draw_masks_proto_cpu_fallback_works() {
        // Force CPU-only backend to ensure the CPU fallback path executes
        let original = std::env::var("EDGEFIRST_FORCE_BACKEND").ok();
        unsafe { std::env::set_var("EDGEFIRST_FORCE_BACKEND", "cpu") };
        let result = ImageProcessor::new();
        match original {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_FORCE_BACKEND", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_FORCE_BACKEND") },
        }

        let mut converter = result.unwrap();
        assert!(converter.cpu.is_some());

        let dst = TensorDyn::image(
            64,
            64,
            PixelFormat::Rgba,
            DType::U8,
            Some(TensorMemory::Mem),
        )
        .unwrap();
        let mut dst_dyn = dst;
        let det = [DetectBox {
            bbox: edgefirst_decoder::BoundingBox {
                xmin: 0.1,
                ymin: 0.1,
                xmax: 0.5,
                ymax: 0.5,
            },
            score: 0.9,
            label: 0,
        }];
        let proto_data = ProtoData {
            mask_coefficients: vec![vec![0.5; 4]],
            protos: edgefirst_decoder::ProtoTensor::Float(ndarray::Array3::<f32>::zeros((8, 8, 4))),
        };
        let result = converter.draw_masks_proto(&mut dst_dyn, &det, &proto_data);
        assert!(result.is_ok(), "CPU fallback path should work: {result:?}");
    }

    #[test]
    fn test_set_format_then_cpu_convert() {
        // Force CPU backend (save/restore to avoid leaking into other tests)
        let original = std::env::var("EDGEFIRST_FORCE_BACKEND").ok();
        unsafe { std::env::set_var("EDGEFIRST_FORCE_BACKEND", "cpu") };
        let mut processor = ImageProcessor::new().unwrap();
        match original {
            Some(s) => unsafe { std::env::set_var("EDGEFIRST_FORCE_BACKEND", s) },
            None => unsafe { std::env::remove_var("EDGEFIRST_FORCE_BACKEND") },
        }

        // Load a source image
        let image = include_bytes!(concat!(
            env!("CARGO_MANIFEST_DIR"),
            "/../../testdata/zidane.jpg"
        ));
        let src = load_image(image, Some(PixelFormat::Rgba), None).unwrap();

        // Create a raw tensor, then attach format — simulating the from_fd workflow
        let mut dst =
            TensorDyn::new(&[640, 640, 3], DType::U8, Some(TensorMemory::Mem), None).unwrap();
        dst.set_format(PixelFormat::Rgb).unwrap();

        // Convert should work with the set_format-annotated tensor
        processor
            .convert(&src, &mut dst, Rotation::None, Flip::None, Crop::default())
            .unwrap();

        // Verify format survived conversion
        assert_eq!(dst.format(), Some(PixelFormat::Rgb));
        assert_eq!(dst.width(), Some(640));
        assert_eq!(dst.height(), Some(640));
    }
}